The problem with any excuse you make for Elon is that Elon is too stupid to keep his mouth shut and give the excuse any plausibility. After the nazi salute he went on Twitter to make nazi puns about it. It is certain beyond reasonable doubt that he knows exactly what the salute was. Even if you give him the insane benefit of the doubt that it was really “his heart going out” and accidentally looked like the salute, his having shown he knows what it looks like but never stating he does not actually believe in the ideology or want present himself as an ally to nazis is just as damning.
Law enforcement AI is a terrible idea and it doesn’t matter whether you feed it “false facts” or not. There’s enough bias in law enforcement that the data is essentially always poisoned.