I think that joke’s been around for a while, but there is the Terry Pratchett line about how if you had a button with a sign next to it saying “pressing this button will end the world, do not touch,” the ink wouldn’t even have time to dry.

How many do you think it is, and how much more acceptable is that number than this one?

“There was a particular bad guy near them” and “they all probably have bad opinions about Jews” are not sufficient justifications for indiscriminately bombing innocent people. What if there had been an Israeli leader at that rave? People in both refugee camps and at a music event should be able to exist without fear that they’ll die because they were near the wrong person. One seems to provoke a different reaction than the other for some reason though, and that might be worth thinking about.

There is never going to be a case where the world misses the answer to the ultimate question of life, the universe, and everything because it was said by a Nazi and everyone refused to listen to the Nazi. When it’s clearly straight up propaganda, it’s perfectly rational to dismiss it due to the source and not investigate further. If there’s a valid and useful point to be made, it’ll get made in more respectable sources too and then it might be time to pay attention. Plus, even if they do cite sources, it’s hard to spot where they’ve twisted or lied about those sources, but it’s really easy for the propagandist to spout whatever nonsense they believe because they don’t care about the truth. That asymmetry is good for the Nazi and bad for decent people, and the way to fix that is don’t waste your time carefully investigating and critiquing Nazi bullshit.