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The fallacy of assuming that it's possible to convince or argue with anyone about anything—even the most absurd, unacceptable, or monstrous positions—through sufficient rationality, evidence, and persuasion. The fallacy ignores that some positions are not reached through reason and cannot be dislodged by it. You cannot argue someone out of a position they didn't argue themselves into. The defender of slavery, the apologist for genocide, the advocate of racist policies—these are not positions that yield to evidence because they were not based on evidence. The Fallacy of Impossible Convincing is beloved of those who believe that all disagreement is misunderstanding, that all conflict can be resolved through dialogue, that the only problem is insufficient communication. It's a noble fallacy, but a fallacy nonetheless.
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