In no way am I excusing the horrible treatment black people and indigenous people have received in the USA. It’s awful and definitely crimes that should have been prosecuted and the failure to do so is a stain on America and the ideals people want it to hold. But noting that it’s qualitatively and quantitatively different from a government organized industrial extermination machine doesn’t seem like something crazy. And pretending like power dynamics aren’t in play in terms of prosecuting Nazis is naive - it’s literally what Nazis said at the Nuremberg trials - it’s a sham trial because it’s just the victors killing the defeated. But it did manage to establish some kind of minimum legal framework even if it’s not as far as we’d have liked. Also important to remember that the US committed abhorrent legitimate war crimes in Vietnam even by Nuremberg standards - but the US is a super power and it’s an unsolved problem about who will hold a superpower (or even a nuclear power) to count for crimes against humanity.