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A bias where one applies rigorous proof standards only to claims they disagree with, while accepting weak or no evidence for claims they favor. Selective proof bias is the hallmark of motivated reasoning: the same person who demands double‑blind studies for acupuncture will accept anecdotal testimonials for their preferred supplement; who insists on “proof of harm” for environmental regulations will accept speculation about economic benefits. The bias lies not in the standards themselves but in their inconsistent application.
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