Fallacy of Impossible Argument

A rhetorical fallacy where someone demands an argument that meets impossible standards of completeness, rigor, or certainty—then rejects any actual argument for falling short. The perfect becomes the enemy of the good; the impossible becomes the standard for the possible. Common in debates where one side demands that the other address every possible objection, consider every alternative, or achieve absolute certainty before their argument can be considered valid. The fallacy lies in using impossibility as a shield against engagement.

"I presented evidence for my position. Response: 'But you haven't addressed every possible counterargument, so your argument fails.' That's Fallacy of Impossible Argument—demanding completeness that no real argument possesses. Arguments are judged by overall weight, not perfect address of all possibilities. Demanding the impossible is a way of refusing the possible."

by Dumu The Void February 28, 2026