Evidence Defaultism

A cognitive bias where one automatically assumes that the absence of immediate, tangible, or conventionally formatted evidence is sufficient grounds to dismiss a claim, without considering that evidence might exist in other forms, be inaccessible, or be contextually inappropriate. The evidence defaultist treats their own evidentiary standards as universal and self‑justifying, and any failure to meet those standards is treated as proof of falsehood or irrationality. This bias often appears in online debates where one party demands “evidence” for spiritual, experiential, or historical claims, then declares victory when the other party cannot produce a peer‑reviewed study on demand. Evidence defaultism confuses “lack of evidence I accept” with “lack of evidence altogether.”

Example: “He asked for a randomized controlled trial proving that her grandmother’s herbal remedy worked for her family. When she couldn’t produce one, he declared the remedy worthless. Evidence defaultism: demanding a specific kind of evidence and ignoring all other forms of knowing.”

Evidence Defaultism by Abzugal April 18, 2026