Logical Fallacies Every Writer Should Recognize | Writing Guide

I see these fallacies in manuscripts, in the news and in my own first drafts, and they drive me crazy every time. A bad argument feels wrong to readers even when they can’t name the problem, and they stop trusting you.

Why Do Writers Need to Understand Logical Fallacies?

In a novel, a fallacy in a character’s persuasive speech makes them sound manipulative instead of persuasive, which works when you planted it on purpose and hurts when you didn’t. For more, see why every writer should embrace AI as a digital assistant and logical fallacies in fiction.

I care about this more than most craft topics because a fallacy in a nonfiction book costs the author something real.

A reader who catches one sloppy argument on page 40 starts doubting page 41, then the chapter after that, then the credentials on the back cover. The author never hears about it. The book just stops getting recommended, and nobody ever tells them why.

Fallacies make you a better writer in two directions once you know them.

In fiction, you can use fallacies deliberately. A politician character who relies on straw man arguments. A cult leader who exploits appeals to authority. A parent who deploys slippery slope reasoning to control a teenager. These become tools for building complex, realistic characters whose flawed logic reveals their psychology.

For more, see logical fallacies. In nonfiction and ghostwriting, fallacies are landmines. I’ve worked on 54+ ghostwritten books, and one of my jobs during the revision process is identifying places where a client’s argument accidentally relies on faulty reasoning.

A CEO’s memoir that uses false cause to credit a single decision for company growth. A self-help book that builds its entire structure on circular reasoning. These problems destroy the book’s authority with educated readers. Here are 14 fallacies every writer should recognize, with examples from books and film that show how they work in practice.

Appeal to Popular Belief (Ad Populum): “Everyone Thinks So” Must Mean It’s Right

The appeal to popular belief is when someone argues that if a majority believes something, it must be true. This fallacy assumes popularity equals correctness. That can overlook important nuances or minority perspectives. Examples of Appeal to Popular Belief:

• Example: “Most people believe that social media harms mental health, so it must be true.”
• Example: “Since a large percentage of the population opposes higher taxes, they must be a bad idea.”
• Example: “Everyone I know is against mandatory voting, so it’s clearly not democratic.”

How to Spot It: Look for phrases like “everyone believes” or “most people think.” An opinion grounded only in popularity without supporting facts or reasoning may be using this fallacy.

How to Avoid It: Instead of using popularity as proof, provide data or logical support. Instead of “most people believe X,” explain why X might be true or untrue with evidence.

In Film: In Mean Girls, characters believe that certain people in school are inherently “cool” because everyone says so. This popularity-driven mentality leads to problematic behavior and conformity.

In Literature: In George Orwell’s Animal Farm, the animals believe certain maxims (“Four legs good, two legs bad”) simply because they’re repeated frequently.

Hasty Generalization: Rushing to Conclusions with Insufficient Evidence

Hasty generalizations happen when a writer makes broad claims based on insufficient or selective evidence. These can lead to stereotypes or misleading overgeneralizations. Examples of Hasty Generalization:

• Example: “I had a negative experience with a ride-share driver, so all ride-share services are unsafe.”
• Example: “After hearing about a few tech employees being overworked, I believe all tech jobs are unhealthy.”
• Example: “My relative struggled in online learning, so virtual education doesn’t work for anyone.”

How to Spot It: Look for sweeping statements that rely on limited examples, often using terms like “always,” “never,” or “all.”

Tips for Avoiding It: Use sufficient, representative evidence before making broad claims. Phrasing statements with “often,” “sometimes,” or “in many cases” adds nuance, making your argument more accurate.

In Film: In Zootopia, Judy Hopps initially believes that all foxes are untrustworthy based on a single negative childhood experience, a hasty generalization that affects her interactions with Nick Wilde until she learns otherwise.

In Literature: In To Kill a Mockingbird by Harper Lee, many townspeople generalize that all African Americans are dishonest or dangerous based on stereotypes, a clear example of hasty generalization with serious consequences.

I catch hasty generalization in nonfiction manuscripts more than any other fallacy. One story, one survey or one bad experience with an agent, and suddenly the author is telling readers what “all” of something does. Readers who know the field spot it in a sentence, and the author loses them for the rest of the chapter. Three examples won’t carry a claim that starts with “every.”

False Dilemma (Either/Or Fallacy): Reducing Complex Choices to Two Options

The false dilemma fallacy simplifies complex issues into only two options, ignoring other possible perspectives. This either/or thinking can mislead readers into believing there’s no middle ground. Examples of False Dilemma:

• Example: “Either we allow complete freedom of speech, or we’ll have no freedom at all.”
• Example: “You’re either with us, or you’re against us.”
• Example: “If you don’t support this policy, you don’t care about children.”

How to Spot It: Look for arguments presenting only two choices on a complex issue, using language like “either/or” or “only two options.”

Avoiding the False Dilemma: Recognize that most issues have multiple perspectives. Offer more than two choices by using phrases like “another option might be…” or “some might suggest…”

In Film: In Star Wars: Revenge of the Sith, Anakin tells Obi-Wan, “If you’re not with me, then you’re my enemy,” presenting a false choice between loyalty and enmity.

In Literature: In 1984 by George Orwell, the Party often presents the idea that you’re either completely loyal to the regime or a dangerous traitor, with no middle ground allowed for dissent.

Appeal to Authority (Ad Verecundiam): Trusting the Expert Blindly

An appeal to authority occurs when someone argues something must be true because an authority figure or expert believes it. While expert opinions add value, they shouldn’t be the sole basis of an argument, especially if the authority isn’t qualified in the relevant field. Examples of Appeal to Authority:

• Example: “A popular chef endorses this diet, so it must be healthy.”
• Example: “The CEO of a tech company believes climate change is a myth, so it must be questionable.”
• Example: “A famous actor supports this political candidate, so they must be trustworthy.”

How to Spot It: Look for arguments that rely solely on a person’s reputation without providing additional evidence. Phrases like “as an expert said…” can indicate this fallacy.

How to Avoid It: When citing an expert, ensure they’re qualified in the relevant topic and supplement their opinion with facts or additional analysis.

In Film: In Jurassic Park, the characters initially trust Dr. Hammond’s assurances about the park’s safety because of his reputation, only to realize later that his expertise doesn’t extend to understanding the dangers he’s created.

In Literature: In Harry Potter and the Goblet of Fire, the public trusts Rita Skeeter’s articles because she’s a well-known journalist, even though her stories are often biased or outright false.

I hate appeal to authority in writing advice.

Somebody famous said never use adverbs, or write every day, or outline everything, and thousands of new writers treat it as law without asking whether it fits how they work. Credentials tell you who’s talking. They don’t tell you whether the advice is any good for your book.

Straw Man Fallacy: Misrepresenting an Opponent’s Argument for Easy Attack

The straw man fallacy misrepresents an opponent’s position to make it easier to criticize. By oversimplifying or exaggerating someone else’s argument, writers can divert attention from the issue at hand. Examples of Straw Man Fallacy:

• Example: “Those who support alternative energy want to ban cars and trucks completely.”
• Example: “Anyone against increasing the minimum wage doesn’t care about the poor.”
• Example: “If you support privacy rights, you must be hiding something illegal.”

How to Spot It: Look for arguments that simplify or distort the opposition’s actual position. This fallacy often sets up an “us vs. them” narrative. Avoiding the Straw Man: Address the real argument instead of a misrepresented version. Accurately representing opposing views adds credibility to your position. In Film: In The Dark Knight, the Joker misrepresents Batman’s intent, suggesting Batman is just as dangerous as the criminals he fights, twisting the true nature of Batman’s role. In Literature: In Pride and Prejudice, Mr. Collins often misrepresents Elizabeth’s rejections, assuming she’s merely playing hard-to-get, a misrepresentation of her real disinterest.

Circular Reasoning (Begging the Question): Arguing in a Loop Without Proof

Circular reasoning is when an argument’s conclusion is the same as its premise, creating a loop without real support. This form of reasoning assumes the truth of what it’s trying to prove. Examples of Circular Reasoning:

• Example: “This law is good because it’s the law.”
• Example: “I’m honest because I always tell the truth.”
• Example: “Exercise is beneficial because it’s healthy.”

How to Spot It: Look for arguments that merely restate the premise as a conclusion without providing supporting evidence.

How to Avoid It: Provide evidence or reasons for your claim instead of repeating it in different words. Instead of saying “it’s true because it’s right,” explain why it’s right with data or examples.

In Film: In Monty Python and the Holy Grail, the logic for determining if a woman is a witch is circular: if she weighs as much as a duck, she’s a witch, without any scientific or rational basis.

In Literature: In Alice’s Adventures in Wonderland, the Queen of Hearts claims her actions are justified because she’s the queen, relying on her authority without logical reasoning.

Slippery Slope: Assuming a Small Step Leads to a Major Disaster

The slippery slope fallacy assumes that one small action will inevitably lead to extreme consequences. Although some events can escalate, the slippery slope exaggerates the likelihood of drastic outcomes. Examples of Slippery Slope:

• Example: “If we allow students to bring cellphones, they’ll stop paying attention in class and fail.”
• Example: “Legalizing marijuana will lead to the legalization of all drugs.”
• Example: “Allowing remote work will eventually make in-person offices obsolete.”

How to Spot It: Look for arguments that claim a single action will lead to a drastic consequence, often without logical progression.

Avoiding Slippery Slopes: Challenge the assumptions that a small step must lead to catastrophe. Provide specific evidence that supports a realistic outcome instead of an exaggerated chain reaction.

In Film: In The Incredibles, the idea that everyone can be “super” is feared to make “being super” meaningless, implying that equality diminishes uniqueness in a slippery slope fashion.

In Literature: In Lord of the Flies, the boys believe that without strict rules, they’ll all descend into chaos and savagery, a slippery slope that plays out in the story.

Slippery slope is the favorite fallacy of people who want to scare you out of a decision. I hear it aimed at new writers all the time: self-publish once and no agent will ever touch you, open one AI tool and you’re a fraud. Fear dressed up as logic keeps a lot of good books in drawers, and the people making the argument pay no price when they turn out to be wrong.

Appeal to Ignorance (Ad Ignorantiam): Arguing Something Must Be True Because It Hasn’t Been Proven False

Someone commits the appeal to ignorance fallacy when they claim that a proposition is true simply because it hasn’t been proven false (or vice versa). This reasoning often appears when there’s insufficient evidence to support or refute a claim. Examples of Appeal to Ignorance:

• Example: “No one has proven aliens don’t exist, so they must be out there.”
• Example: “There’s no evidence against this new diet, so it must be safe.”
• Example: “Since no one has proven ghosts aren’t real, they must exist.”

How to Spot It: Look for arguments that rely on a lack of evidence instead of positive proof. Terms like “no one can prove it wrong” often indicate this fallacy. How to Avoid It: Instead of basing an argument on the absence of evidence, seek verifiable facts that support or refute the claim. In Film: In Contact, characters argue about the existence of extraterrestrial life based on the lack of evidence for or against it. That’s an appeal to ignorance. In Literature: In The X-Files novels, Mulder often argues that aliens exist because no one has disproven it. That’s the same fallacy.

False Cause (Post Hoc Ergo Propter Hoc): Mistaking Sequential Events for Causation

The false cause fallacy assumes that because one event follows another, the first event must have caused the second. This mistaken causation often overlooks other factors that may be responsible. Examples of False Cause:

• Example: “Since crime rates increased after the new mayor took office, the mayor caused the crime spike.”
• Example: “After adopting a new curriculum, student scores fell, so the curriculum must be the problem.”
• Example: “Our sales dropped after we hired a new manager, so it’s the manager’s fault.”

How to Spot It: Look for arguments that link two events simply because one occurred after the other, often using phrases like “since then” or “afterward.” How to Avoid It: Examine if there’s direct evidence of causation instead of assuming that sequence implies cause. Consider alternative explanations for the outcome. In Film: In Jaws, the town believes that shutting down the beaches will prevent shark attacks, falsely linking one action to an unrelated cause. In Literature: In The Great Gatsby, Gatsby assumes his wealth will bring Daisy back to him, incorrectly linking money as the cause of love.

Appeal to Pity (Ad Misericordiam): Seeking Sympathy Instead of Providing Evidence

This fallacy, the appeal to pity, tries to win support for an argument by appealing to the audience’s emotions instead of presenting facts. While sympathy is valid, it shouldn’t replace evidence in forming a strong argument. Examples of Appeal to Pity:

• Example: “You can’t arrest him; he’s a struggling father just trying to make ends meet.”
• Example: “I worked so hard on this project; you have to give me a passing grade.”
• Example: “Please support this policy; it’s my only chance to escape poverty.”

How to Spot It: Look for arguments that rely heavily on emotional language and personal struggles instead of logical reasons. How to Avoid It: Provide logical support instead of relying solely on emotional appeals. Balance empathy with facts to strengthen the argument. In Film: In Legally Blonde, Elle’s courtroom argument includes appeals to sympathy to sway the jury, relying more on emotion than legal evidence. In Literature: In A Christmas Carol, Bob Cratchit uses pity to evoke empathy for his family’s struggles, especially around Tiny Tim’s health.

Red Herring: Distracting from the Real Issue

The red herring fallacy diverts attention from the main issue by introducing irrelevant information. This diversion tactic can confuse readers and dilute the strength of the argument. Examples of Red Herring:

• Example: “I know I missed the deadline, but let’s focus on the fact that I worked late hours.”
• Example: “You might think the product is overpriced, but have you considered how long we’ve been in business?”
• Example: “The economy is struggling, but let’s talk about how much we’ve improved tourism.”

How to Spot It: Look for statements that introduce unrelated topics or irrelevant details to shift focus away from the original issue. How to Avoid It: Stay focused on the central argument, and avoid bringing in topics that don’t directly contribute to resolving the issue. In Film: In Finding Nemo, Dory often distracts Marlin from his goals by bringing up irrelevant topics, a humorous example of a red herring. In Literature: In Sherlock Holmes stories, suspects often introduce irrelevant information to mislead Holmes, hoping to distract him from the real clues.

Equivocation: Using Ambiguous Language to Mislead

Equivocation uses ambiguous language to mislead or obscure the truth. This fallacy often relies on words with multiple meanings to deceive readers subtly. Examples of Equivocation:

• Example: “The sign says ‘fine for parking here,’ so it must be okay to park here.”
• Example: “I didn’t lie; I just gave an alternate version of events.”
• Example: “He’s a ‘natural’ candidate, so he must be the right choice.”

How to Spot It: Look for words that can have multiple meanings and consider if the speaker is using them to obscure the argument’s real intent. How to Avoid It: Be precise in your language and clarify terms that could have multiple interpretations to ensure clarity. In Film: In Pirates of the Caribbean, Jack Sparrow often uses vague or double-meaning words to mislead or manipulate others. In Literature: In Macbeth, the witches’ prophecies are full of equivocations, leading Macbeth to misinterpret their predictions.

Loaded Question: Asking a Question That Presumes Guilt

A loaded question builds the guilt right into the asking, so any answer convicts you. Have you stopped cheating on your taxes? This tactic can be unfair and manipulative. Examples of Loaded Question:

• Example: “Have you stopped lying to your boss?”
• Example: “Why did you choose to ignore your responsibilities?”
• Example: “Do you still neglect your duties at work?”

How to Spot It: Look for questions that assume something unproven as fact, often putting the respondent in a defensive position. How to Avoid It: Phrase questions neutrally, without assumptions, allowing the respondent to answer freely without implication. In Film: In A Few Good Men, lawyers use loaded questions to provoke responses that fit their narrative. In Literature: In To Kill a Mockingbird, Atticus Finch often rephrases loaded questions to get truthful, unbiased answers.

Appeal to Tradition: Arguing Something Is Correct Because It’s Always Been Done

With the appeal to tradition, a person assumes that something is good or true simply because it’s always been done that way. This can ignore possible improvements or modern alternatives. Examples of Appeal to Tradition:

• Example: “We’ve always done it this way, so it must be right.”
• Example: “Our family has always voted this way, so it’s the best choice.”
• Example: “Traditional diets are healthier because they’ve been around longer.”

How to Spot It: Look for arguments that rely solely on the length of time something has been practiced without examining its current relevance or effectiveness. How to Avoid It: Base arguments on current evidence and practical benefits instead of relying solely on tradition. In Film: In Fiddler on the Roof, Tevye constantly refers to “tradition” as justification for cultural practices, even when they no longer serve their original purpose. In Literature: In The Giver, the community insists on certain rules simply because they’ve always existed, without questioning their purpose.

Sunk Cost Fallacy: Continuing Because of What You Already Spent

The sunk cost fallacy treats money, time, or effort already spent as a reason to keep spending. The spent resource is gone either way, so it should carry no weight in the next decision.

How to Spot It: Look for arguments that cite what has already been invested and not what the next investment buys.

How to Avoid It: Ask what you would do if the situation landed on your desk today with no history attached.

In Film: In The Bridge on the River Kwai, Nicholson can’t destroy the bridge his men built, because the work already done has become the reason to protect it.

In Literature: In Moby-Dick, Ahab has spent too much on the hunt to abandon it, and every further loss becomes another reason to continue.

Sunk cost is the one I’d tattoo on every writer’s wrist if I could.

Writers keep revising a manuscript that stopped working several drafts ago because they’ve already spent years on it, and those years become the reason to spend another. The time is gone whatever you decide. The only question worth asking is whether the next hour on this book beats the next hour on a different one.

I cover this one in depth in The Sunk Cost Fallacy: Why Smart People Keep Paying for Bad Decisions, including the test that separates it from persistence.

How can writers use logical fallacies as tools?

Fallacies have uses past avoiding them. In fiction, fallacies become character tools. A villain who relies on false dilemmas to manipulate followers. A parent who uses appeal to tradition to resist change. A lawyer who deploys loaded questions in cross-examination. Used on purpose, they reveal how characters think, argue, and attempt to control others.

Intention matters. When a character uses a fallacy, the reader should see it as a trait of that character and never suspect the author of sloppy thinking. When a nonfiction argument uses one, the reader loses trust in the entire book, and I think that’s a fair price. An author who asks for a reader’s hours owes them reasoning that holds up.

For more on building characters whose arguments and reasoning reveal their psychology, see the Deep Character Handbook. For writing dialogue where characters argue, persuade, and manipulate through conversation, see the AI-Enhanced Dialogue Handbook.

Schedule a free consultation to discuss your book project.

Learn these and you’ll catch the lazy arguments everybody else makes, including the ones hiding in your own draft. A nonfiction author who asks readers for their trust and then hands them circular reasoning is making a bad bet, because the readers who notice are exactly the ones who would have recommended the book to everyone they know. Just don’t turn into the guy who shouts the Latin name of a fallacy at dinner.

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