[knzhou]

Suppose I run a fake investment company that pretends to double your money, but actually just steals it. Suppose you find out all my claims are lies, and demand your money back. How would you react if I said "The absence of evidence is not the evidence of absence. The prior probability of my investment strategy working is nonzero. Now give me more money."

Just pointing out that priors can't be zero isn't a principled stance, it's Pascal's mugging. You can use it to justify literally anything.