He basically called for BLM protestors to be massacred, he would be even more dogmatically in support of the Palestinian genocide based on what I know of him (and accordingly zionists love him), he started and popularized the sinophobic rhetoric and really ramped up anti Chinese FP in a way no other president that I know of has.

He also went from some concrete steps towards normalizing relations with Iran under Obama to an actual exchange of fire with them. An attack on Iran is one of the more realistic imperialist ambitions and it would kill the most people of anything short of a nuclear exchange. He also stepped backwards on Cuba, though not to anywhere near the same degree.

I think you can make a case that Republicans do worse things abroad in general, but that is quickly undercut by libs abandoning any sort of anti-imperialist sentiment whenever their guy is in the White House.

...the problem with that point is that libs railing against wars under a Republican president does not result in a Democratic president meaningfully changing anything. Where something approaching meaningful change has happened under a Democrat (the withdrawal from Afghanistan) libs have panned or ignored it, too (and of course Biden is sanctioning the hell out of Afghanistan now and I'm sure we're still fucning around with some version of the Islamic extremists we've bankrolled for the last half century, see the ETIM and Pakistan, generally).