Sorry, I should've clarified that I meant "unfalsifiable" not in the sense that it's impossible to evaluate statistically but in the sense that it's weasel wording, where regardless of the evidence, you can always retreat and declare what you said isn't false because you never made a specific enough claim compared to what you're implying.

"Doctors believe vaccines cause autism." is true in the sense that there are doctors who exist who believe that, even if the overwhelming consensus of the medical community is that the claim is fraudulent nonsense.

(Yes, I recognize the irony in retreating to a clarification of what I said; it wasn't intentional.)

I remember spending a lot of time on the Holocaust in history and almost zero time on the Native American Genocide.