I am not sure the group that thinks American Imperialism has killed millions is significant in American politics. Perhaps here on Lemmy there are quite a few people who rightly say this, but the vast majority of Americans reject this thought outright.

I agree with this, and my comment really focusses on the discussion here, on this niche forum. But I do think that a slightly amended version of this sentiment is broadly popular in the electorate. Something along the lines of “bring our boys home” or “we don’t need to be spending our tax dollars on this”. The motivation is much more selfish, but the desired outcome has significant overlap with the anti-imperialist sentiment, namely the cessation of war or funding genocide (the anti imperialist stance is broader than this, and would for example also be against the sanctions on Cuba, but this people really just don’t give a shit about generally). I believe it’s a big part of why the candidate promising “no new wars” won over the candidate promising to “ensure that america has the most lethal fighting force in the world” in the last presidential election.

No notes on the rest of your comment. “Fuck you I got mine” is infuriating.