What Is a Logical Fallacy?
A logical fallacy is a flaw in reasoning that makes an argument invalid, even if the conclusion happens to be true. Fallacies are persuasive because they feel logical on the surface. Recognizing them is one of the most valuable critical thinking skills you can develop.
Ad Hominem — Attacking the Person, Not the Argument
Instead of addressing what someone said, you attack who they are. "You can't trust his opinion on healthcare — he's not even a doctor." This might seem reasonable, but non-doctors can cite valid research. Judge the argument, not the arguer.
Straw Man — Distorting the Opponent's Position
You exaggerate or misrepresent someone's argument to make it easier to attack. "I think we should have stricter gun regulations." → "So you want to take away everyone's guns?" The actual position was distorted into an extreme. This is everywhere in political discourse.
Appeal to Authority — "An Expert Said So"
Experts can be wrong, and sometimes they speak outside their area of expertise. A famous physicist's opinion on economics doesn't carry special weight. Ask: is this person an authority in this specific field? Does the broader consensus support them?
False Dilemma — Presenting Only Two Options
"You're either with us or against us." Most real-world issues have multiple positions, nuances, and middle grounds. When someone presents only two options, ask: what other possibilities are being excluded?
Correlation vs. Causation
"Ice cream sales and drowning deaths both increase in summer, so ice cream causes drowning." Obviously absurd — both are caused by a third factor (hot weather). Yet this fallacy appears constantly in news reporting of studies.
Slippery Slope
"If we allow A, then B will happen, then C, and eventually Z." Each step in the chain might be possible, but treating the entire sequence as inevitable is a logical error. Evaluate each step independently.
Sharpen your reasoning skills with our Critical Thinking Quiz.