Informal Fallacies: Weak Induction
Fallacies of weak induction — hasty generalization, false cause, slippery slope, and weak analogy — where the evidence is insufficient for the conclusion.
When the Evidence Is Not Enough
Unlike fallacies of relevance (where the evidence is about the wrong thing), fallacies of weak induction provide evidence that is relevant but insufficient to support the conclusion.
Hasty generalization draws a broad conclusion from too little evidence. 'I met two rude people in Paris, so the French are rude.' Two encounters cannot characterize 67 million people. This fallacy drives stereotypes, bad policy, and media narratives that treat anecdotes as trends.
False cause (post hoc ergo propter hoc) assumes that because one event followed another, the first caused the second. 'The economy improved after the president took office, so the president's policies caused the improvement.' Economic cycles have many causes, and the timing may be coincidental. This fallacy is ubiquitous in political messaging because politicians always claim credit for positive trends and blame predecessors for negative ones.