Logical Fallacies

It's one of the oldest tricks in the book: attempt to discredit the messenger so you don't have to face the message. Rather than engaging with the substance of an argument, the person attacks the character, circumstances, or personal attributes of the individual making the claim. The truth or falsehood of a claim stands independent of who voices it.

Example: She argues for climate policy reform, but she flies on private jets. We can't take her seriously.

An all-too-common strategy in political discourse and social media debates.

The person distorts your argument into a weaker version so they can easily tear it down. Instead of engaging with your actual point, they invent a flimsy one and proudly defeat it. It's intellectual dishonesty disguised as debate.

Example: You support healthcare reform? So you want the government to control every aspect of our lives?

A classic move for anyone more interested in winning than understanding.

They present two extreme options as if they're the only possibilities. Also known as the "either/or" fallacy, this artificially limits the options available, forcing a choice between two extremes while ignoring the spectrum of possibilities that exist between them. It's a favorite tool of those seeking to polarize rather than illuminate.

Example: Either we cut all social programs, or the economy will collapse completely.

This thrives in political and social media echo chambers where nuance goes to die.

This fallacy occurs when someone argues that a claim must be true simply because an authority figure says so, without presenting the actual reasoning or evidence. Gibson's Law puts it well: "For every PhD, there's an equal and opposite PhD." You can find an expert on both sides of any given argument.

Example: A famous actor says this supplement cured their illness, so it must work for everyone.

People often hide behind credentials when logic runs out.

Assuming something is true simply because everyone believes it. Popularity isn't evidence. The crowd has been confidently wrong many times before — from geocentrism to bloodletting. Mass agreement is a social phenomenon, not a logical proof.

Example: Every major company is implementing this management strategy, so it must be the best approach.

The herd may be loudest right before walking off the cliff.

The person argues to continue on the path simply because of what has already been invested. In truth, past effort has no bearing on whether continuing makes sense. Rational decision-making should be based solely on future costs and benefits, not on mourning past investments.

Example: I've already sat through 90 minutes of this terrible movie. I might as well watch the ending.

Smart people cut losses when they no longer make sense. Fools double down.

Someone shifts the topic to something tangential to avoid addressing the issue at hand. This fallacy introduces irrelevant material to divert attention from the original argument. The new topic might be emotionally charged or interesting, but it doesn't address the actual point being debated.

Example: Why should we discuss the budget deficit? We need to talk about the rise of social media addiction among teenagers.

A masterclass in misdirection.

Instead of addressing a criticism, the person points out your flaws to avoid accountability. This fallacy — Latin for "you also" — attempts to deflect criticism by accusing the critic of hypocrisy. Even if the accusation is true, it doesn't address the validity of the original criticism. A hypocrite can still make a valid point.

Example: You criticize my spending habits? You just bought a luxury watch last month.

Alleged hypocrisy doesn't invalidate truth.

Someone draws a sweeping conclusion from very limited evidence. Anecdotes are not data. One case does not make a real pattern. Statistical significance requires adequate sample sizes and proper methodology, not cherry-picked personal experiences.

Example: I met two rude people from that city, so everyone there must be unfriendly.

Humans love shortcuts, but sound logic requires a larger sample size.

The person assumes a claim is false simply because it was argued poorly. Also known as the "argument from fallacy," this concludes that if an argument contains a logical error, its conclusion must be false. In reality, a conclusion can be true even if the reasoning is flawed. A bad map doesn't mean the destination doesn't exist.

Example: You used a straw man argument to defend renewable energy, therefore renewable energy doesn't work.

Don't confuse a poor advocate with a poor idea.

A marksman fires bullets at a wall, then paints a target around the tightest cluster. This fallacy involves selecting data that supports your conclusion while ignoring contradictory data. It's a form of confirmation bias where you retrofit a pattern to random data, creating the illusion of causation where none exists.

Example: Our strategy works perfectly — just look at these five success stories from our portfolio of 200 companies.

Avoid the conflicting evidence by only choosing the good.

Latin for "after this, therefore because of this." The person assumes that because B followed A, A must have caused B. Just because two events occur in sequence doesn't mean the first caused the second. Coincidence, third variables, and reverse causation are all possibilities this fallacy ignores.

Example: The new CEO took over in January and profits increased in March. The CEO's leadership clearly caused the profit increase.

Correlation doesn't equal causation.

Someone insists that one small step will inevitably lead to catastrophe, without providing evidence for why each step in the chain is inevitable. Think of it like a parlay bet — the more events linked together, the lower the odds of all of them occurring in the correct order.

Example: If we allow employees to work from home one day a week, soon they'll demand full remote work, then stop working altogether, and the company will collapse.

While some slopes are indeed slippery, this fallacy assumes they all are.

The person claims something is true simply because it can't be proven false. In rational discourse, whoever makes a positive claim bears the responsibility of providing evidence for it. Demanding others disprove your unsupported assertion is intellectually backwards.

Example: There's an invisible dragon in my garage. You can't prove there isn't, so I'm right.

The absence of evidence to the contrary isn't evidence in support.

The person rejects an idea because they can't understand or imagine how it could be true. Our inability to grasp complex concepts or counterintuitive truths doesn't render them false. Quantum mechanics, relativity, and countless other verified phenomena defy common intuition yet remain true.

Example: I can't understand how evolution could create something as complex as the human eye, therefore it must be false.

Complex ideas often look absurd before they're real.

Someone raises a question that smuggles in an accusation or assumption. The question is pre-loaded with a presumption of guilt — no matter how you answer, you lose. It's linguistic entrapment that treats controversial assumptions as established facts. The proper response is to reject the question's premise entirely.

Example: How long have you been embezzling funds from the company?

A classic rigged game used by prosecutors, politicians, and bad-faith interviewers.

The person redefines a group to protect their claim from counterexamples, shifting the rules mid-argument to stay in the right. When faced with contradictory evidence, instead of revising the claim, the arguer changes what qualifies as a valid member of the group. It's circular reasoning wrapped in definitional manipulation. Example dialogue: "No successful entrepreneur gives up easily." "What about Sarah?" "Well, she's not a true entrepreneur then."

Example: No successful entrepreneur gives up easily. What about Sarah? Well, she's not a true entrepreneur then.

Rather than acknowledge the counter-argument, the terms are changed to exclude it.

The same word is used in two different ways to mislead the opponent. It sounds consistent on the surface, but the meaning quietly shifts. This fallacy exploits the multiple meanings of a word or phrase, using one definition in the premise and another in the conclusion.

Example: The law requires us to treat all citizens equally. Therefore, we should give everyone the exact same income regardless of their work.

Imprecise language leads to imprecise argument.

Latin for "it does not follow." The conclusion has no logical connection to the premises offered. While all fallacies involve faulty reasoning, non-sequitur is the catch-all for conclusions that simply don't follow from their stated support. The leap from evidence to conclusion crosses a chasm of missing logic.

Example: Our competitor launched a new product last month. We should clearly redesign our office space.

Beware the conclusion out of thin air.

Also called circular reasoning, this fallacy occurs when an argument's premise assumes the truth of the conclusion instead of supporting it. It's a closed loop that provides no actual evidence, just restatement. The argument goes nowhere because it starts where it claims to end.

Example: This book is divinely inspired because it says so in the book itself, and divine texts don't lie.

A logical dog chasing its own tail.