On the other hand, when someone claims something is impossible/something has never happened before/something happens every single time, but you have just 1 anecdote from a credible source that contradicts that claim, then that 1 anecdote is enough to know that they are wrong.
Example: some pundit states: our government has never executed an innocent man. You just need proof that they have executed a single innocent man to show that the pundit has no credibility on the subject and that it’s thus not an impossibility that other executed men were also innocent.
Maybe it’s because it was in the same language group as those others that polish got singled out. People who speak an Indo European language will expect to be lost when first trying to learn a language outside of the group, but might not expect to be so confuddled from a related language. Expectations basically.