Bulverism

informal Fallacy

Bulverism assumes an opponent's claim is false without argument, then explains away their belief by attacking their motives or psychology.

Example of Bulverism

A student objects that a proposed campus policy will cost more than the budget allows. The organizer replies, "You're only saying that because you've never had to rely on student services." The organizer never addresses the budget figures and instead assumes the objection is wrong, explaining it away by the student's background.
A scientist publishes results questioning a popular health claim, and a commentator responds, "Of course a contrarian academic would say that — it's how you get attention." The commentator presumes the findings are false and offers a motive-based explanation instead of engaging with the data or methodology.

Note

Bulverism is closely related to, but narrower than, the genetic fallacy and the ad hominem. What distinguishes it is the two-step structure: first the opponent's wrongness is silently assumed, then a psychological or sociological origin story is supplied for the supposed error. Note also that explaining the origins of a belief is perfectly legitimate after it has been independently shown to be false — historians and psychologists do this routinely. The fallacy lies only in reversing the order.

Bulverism

Extended Explanation

Bulverism is a logical fallacy in which someone skips the work of showing that an opponent's claim is false and instead jumps straight to explaining why that opponent came to hold such a mistaken view — usually by appealing to their psychology, class, upbringing, gender, or hidden motives. Because the falsity of the claim is assumed rather than demonstrated, the argument begs the question while wearing the costume of insight.

The fallacy is seductive because diagnosing a person feels more interesting and more final than examining an argument. It also flatters the speaker: to explain an opponent's error is to position oneself as the clear-sighted observer standing above the fray. Bulverism combines begging the question (the conclusion that the opponent is wrong is smuggled in as a premise) with a form of the ad hominem circumstantial (the opponent's circumstances are treated as sufficient explanation). Crucially, even if the psychological story is accurate, it says nothing about whether the claim is true — people can arrive at correct conclusions for biased reasons.

The term was coined by C. S. Lewis in a 1941 essay, later published as "Bulverism," in which he invented a fictional character named Ezekiel Bulver who, as a boy, heard his mother tell his father during an argument about geometry, "Oh you say that because you are a man." Lewis's point was that the twentieth century had grown fond of Marxist and Freudian style explanations — dismissing a view as bourgeois ideology or neurotic projection — while forgetting to first establish that the view was actually wrong. "You must show that a man is wrong before you start explaining why he is wrong," Lewis wrote.

To spot Bulverism, listen for responses that begin with "You only believe that because…" and then never return to the evidence. A useful test is to ask whether the explanation offered would also apply to someone who happened to be right; if so, the explanation is doing no logical work. The counter is simple and disarming: grant the psychological story for the sake of argument and then ask for the refutation anyway — "Suppose my background does incline me this way. Is the claim true or false, and why?"

Writing an argument? Make sure Bulverism isn't hiding in your own draft. The Writing Lab checks your writing for this and every other fallacy — and the cognitive biases behind them.

Check your writing →