Logical Fallacy Spotter

Sharpen your reasoning by learning to identify 30+ common logical fallacies. Analyze arguments, spot flawed reasoning, and build stronger, more persuasive cases in an age of information overload.

Health & Safety Boundary

This skill provides educational instruction in logic, reasoning, and argument analysis. It does not diagnose, treat, or manage any medical, psychological, or cognitive condition. Logical reasoning education is not a substitute for mental health treatment, cognitive behavioral therapy, or professional counseling.

When to Use / When Not to Use

Use this skill when you want to:

• Learn to identify logical fallacies in arguments, media, and everyday conversation
• Analyze whether a claim is well-supported or relies on flawed reasoning
• Strengthen your own arguments by eliminating fallacious reasoning
• Prepare for debates, discussions, or persuasive writing
• Develop the critical thinking habit of examining reasoning structure

Do not use this skill to:

• Diagnose psychological conditions or cognitive biases requiring clinical attention
• "Win" arguments by attacking people — this skill teaches constructive analysis, not weaponized logic
• Replace formal logic or philosophy education
• Make legal arguments or claims about truth in judicial contexts

How to Use This Skill

Work through the following stages with the assistant. Answer questions honestly — the guidance adapts to your needs.

1. CONTEXT & GOAL

The assistant asks:

• Do you have a specific argument or claim you want analyzed?
• Are you learning fallacies generally, or preparing for a specific context (debate, media analysis, writing)?
• What's your current familiarity with logical fallacies?

2. FALLACY IDENTIFICATION

The assistant presents and explains fallacies from the catalog below, matching your context:

Category 1: Relevance Fallacies (Red Herrings)

Arguments that distract from the actual issue.

Fallacy	Definition	Example
Ad Hominem	Attacking the person, not the argument	"You can't trust her climate policy — she drives an SUV."
Straw Man	Misrepresenting an argument to attack it easily	"You want to reduce military spending? So you want to leave us defenseless?"
Appeal to Authority	Claim is true because an authority figure said so	"This diet works — a celebrity endorses it."
Appeal to Emotion	Manipulating emotion instead of using evidence	"If you care about children, you'll support this policy."
Tu Quoque	Deflecting by accusing of hypocrisy	"You tell me not to smoke, but you used to smoke yourself."
Red Herring	Introducing an irrelevant topic to distract	"Yes, emissions are up, but what about unemployment?"
Appeal to Popularity (Bandwagon)	Claim is true because many believe it	"Everyone's investing in crypto, so it must be smart."

Category 2: Presumption Fallacies

Assuming something unproven or questionable.

Fallacy	Definition	Example
Begging the Question	The conclusion is assumed in the premise	"This book is boring because it's uninteresting."
False Dilemma	Presenting only two options when more exist	"Either you're with us, or you're against us."
Slippery Slope	One step inevitably leads to extreme consequences	"If we allow bike lanes, soon cars will be banned entirely."
Hasty Generalization	Drawing a conclusion from insufficient evidence	"I met two rude Parisians, so all French people are rude."
Post Hoc Ergo Propter Hoc	Assuming causation from sequence	"I wore my lucky socks and we won, so the socks caused the win."
Loaded Question	A question that contains an unjustified assumption	"Have you stopped cheating on your taxes?"
Circular Reasoning	The conclusion restates the premise	"This medicine works because it's effective."

Category 3: Ambiguity Fallacies

Problems arising from unclear language.

Fallacy	Definition	Example
Equivocation	Using a word in two different senses	"A feather is light. What is light cannot be dark. Therefore, a feather cannot be dark."
Composition	Assuming what's true of parts is true of the whole	"Each player is excellent, so the team must be excellent."
Division	Assuming what's true of the whole is true of parts	"The team is excellent, so each player must be excellent."
No True Scotsman	Redefining a category to exclude counterexamples	"No true patriot would question the military."

Category 4: Statistical & Causal Fallacies

Misusing data or causation.

Fallacy	Definition	Example
Correlation vs. Causation	Confusing correlation with causation	"Ice cream sales and drowning rates both rise in summer. Ice cream causes drowning."
Cherry Picking	Selectively using evidence that supports the claim	Citing only the one study that supports your view out of 20.
Gambler's Fallacy	Believing past random events affect future ones	"I've flipped heads 5 times, so tails is due."
Texas Sharpshooter	Finding patterns in random data after the fact	Drawing a target around bullet holes and claiming accuracy.
Survivorship Bias	Focusing on survivors while ignoring failures	"All successful founders dropped out of college, so drop out!"

Category 5: Additional Common Fallacies

Fallacy	Definition
False Equivalence	Treating two arguments as equally valid when they're not
Appeal to Nature	Assuming "natural" means good or better
Appeal to Tradition	Claiming something is better because it's traditional
Middle Ground	Assuming the compromise between two positions is correct
Anecdotal Evidence	Using personal stories instead of data
Burden of Proof Shift	Demanding the opponent disprove your claim
Special Pleading	Making exceptions without justification
Genetic Fallacy	Judging something by its origin rather than its merit

3. ARGUMENT ANALYSIS WORKFLOW

When presented with an argument, the assistant walks through:

1. Extract the claim — What exactly is being argued?
2. Identify premises — What reasons are given?
3. Check for fallacies — Which (if any) fallacies are present?
4. Explain why it's flawed — Why does the fallacy undermine the reasoning?
5. Suggest improvement — How could the argument be strengthened?

4. PRACTICE MODE

The assistant can:

• Present arguments for you to analyze (spot the fallacy)
• Give you a fallacy and ask you to construct an example
• Analyze real-world examples: political speeches, advertisements, social media posts, news articles
• Run a "Fallacy of the Day" exercise with one fallacy explained in detail

5. BUILD STRONGER ARGUMENTS

Learn to construct fallacy-free arguments:

• State your claim clearly
• Provide relevant, sufficient evidence
• Address counterarguments honestly
• Avoid emotional manipulation
• Acknowledge limitations and uncertainty
• Use valid reasoning structures (deductive, inductive, abductive)

6. FOLLOW-UP

• Keep a "fallacy journal" — record fallacies you encounter in daily life
• Practice with increasingly subtle examples
• Learn the difference between formal and informal fallacies
• Explore related topics: cognitive biases, rhetoric, formal logic

Safety Boundaries

1. No clinical use: This skill is educational. It does not address clinical reasoning deficits, delusional thinking, or cognitive disorders.
2. No weaponization: Logic should serve truth-seeking, not humiliation. Don't use fallacy-spotting to attack or belittle others.
3. Context matters: Not every informal argument is a fallacy. Conversational shortcuts, humor, and hyperbole have legitimate uses.
4. Limits of informal logic: This skill covers informal fallacies. Formal logic, mathematical proof, and legal reasoning require additional training.

Universal disclaimer: This skill provides educational instruction in logic and reasoning only. It does not offer medical advice, psychological treatment, legal counsel, or professional judgment. For concerns about cognitive function or mental health, consult a qualified professional.

What This Skill Is Not

• Not a tool for "winning" arguments by technicality
• Not a substitute for formal logic or philosophy education
• Not a diagnostic tool for cognitive or psychological conditions
• Not a license to dismiss emotional or experiential knowledge
• Not exhaustive — the world of logical fallacies is larger than this catalog

Tips for Best Results

• Start with everyday examples — advertisements, headlines, social media
• Practice naming fallacies aloud — builds rapid recognition
• Learn the "greatest hits" first — ad hominem, straw man, false dilemma cover ~70% of common fallacies
• Be humble — everyone uses fallacies sometimes, including you
• Pair with cognitive bias study — many fallacies have bias counterparts
• Read opposing viewpoints — the best way to spot fallacies is to understand the strongest version of arguments you disagree with