Fallacies: C (Part 4)

Core idea

The final C entries move from small factual slips to large structural errors of reasoning. Here are the seductive mistakes: believing a hidden hand secretly runs history, treating two things that move together as cause and effect, assuming the continents were always fixed, and forcing the chaos of history into tidy repeating cycles. These are not trivia errors — they are errors about how the world works.

Why it matters

A wrong fact misleads you once. A wrong pattern misleads you forever, because you keep applying it. Conspiracy thinking, correlation-equals-causation, and cyclical history all give you a false key that seems to unlock everything. That is exactly why they are dangerous: a theory that explains too much, too easily, has usually stopped being a theory and become a faith.

Key takeaways

Mental model

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Practical application

Demand the mechanism before the link

To claim A caused B you need three things: A came before B, A and B genuinely correlate, and a plausible mechanism connects them. Smoking and lung cancer pass all three. The death rate in one city matching a union's membership passes only the second — so it means nothing.

Treat the all-explaining theory with suspicion

Continental drift was rejected because experts trusted their incomplete mathematics over first-rate fossil and rock evidence. A consensus can be confidently, durably wrong. Conversely, a cyclical theory of history "works" only because you can stretch any civilization to fit it. If a model is never wrong, it is not telling you anything.

Watch for the forgery dressed as proof

Conspiracy theories travel with documents — and the documents are fabricated. When a sweeping claim arrives with conveniently perfect evidence, the evidence is the thing to examine first.

Example

A manager notices that sales rise every month the office buys more coffee, and concludes coffee drives revenue. The real story: both rise in busy months because more staff are in. Coffee and sales correlate; neither causes the other. A third factor — workload — drives both. Before acting on a pattern, look for the lurking variable that could be quietly producing both halves of it.

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