What is the appeal to purity fallacy?

The appeal to purity fallacy and the no true Scotsman fallacy are closely related, but the appeal to purity fallacy is broader:

  • Appeal to purity fallacies dismiss deviations from an idealized form, rejecting any variation or nuance within a belief system or identity.
  • No true Scotsman fallacies are a type of appeal to purity that involves dismissing counterexamples to defend a specific claim.