Black swan fallacy
From Iron Chariots Wiki
The black swan fallacy is one in which the arguer ignores contradictory evidence on the basis of past experience.
- A: All of the swans I have ever seen have been white. Therefore, all swans are white.
- B: Here's a black swan.
- A: All swans are white, therefore that can't be a swan.
- One-Sidedness at fallacyfiles.org.