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appeal_to_purity
Appeal to purity (No True Scotsman) is a technique that dismisses counterexamples to a claim by retroactively redefining group membership to exclude inconvenient cases. When confronted with evidence that contradicts a generalization about a group, the speaker declares that the counterexample is not a 'true' member of the group, thereby immunizing their claim against falsification. This creates an unfalsifiable circular definition where group membership is defined by conformity to the generalization.
Claim: 'No real patriot would criticize the military.' When someone points to decorated veterans who have criticized military policy, the response is: 'Well, they're not real patriots then — a true patriot supports the troops no matter what.' The definition of 'patriot' is shifted to exclude any counterexample.
Claim: 'No real entrepreneur would ever take a government grant.' When someone points to successful startup founders who have used public funding, the response is: 'Those aren't real entrepreneurs — a genuine self-made businessperson builds everything without any government handouts.'
Claim: 'No true feminist would ever choose to be a stay-at-home parent.' When examples of self-identified feminists who made that choice are raised, the reply is: 'If they really understood feminism, they wouldn't make that choice — so clearly they aren't genuine feminists.'
Binary (yes/no) questions an LLM must answer to identify this aspect:
Does the argument dismiss counterexamples by claiming they are not 'true' members of the group?
Type: binaryIs the definition of the group being modified after the fact to exclude inconvenient cases?
Type: binaryIs the redefinition used to protect a generalization from legitimate challenge?
Type: binaryAppeal to purity (No True Scotsman) is a technique that dismisses counterexamples to a claim by retroactively redefining group membership to exclude inconvenient cases. When confronted with evidence that contradicts a generalization about a group, the speaker declares that the counterexample is not a 'true' member of the group, thereby immunizing their claim against falsification. This creates an unfalsifiable circular definition where group membership is defined by conformity to the generalization.
It exploits the gap between formal group membership and identity-based group membership. People intuitively feel there is a difference between technically belonging to a group and truly representing it. The technique leverages this intuition to make the exclusion of counterexamples feel natural rather than ad hoc.
Ask: 'What definition of this group are you using, and was it the same definition before I raised this counterexample? If the definition keeps changing to exclude contradictory evidence, isn't the claim unfalsifiable?'
Common in political purity tests (both progressive and conservative), religious fundamentalism, fan communities (gatekeeping 'real' fans), and national identity debates. Used to enforce ideological conformity within movements by threatening to revoke group membership for dissent.
Use these tools to detect, analyze, or train this aspect.