I don't really recall hatred during Bush Jr. Lots of ridicule. "Nukular". [snicker] He actually benefitted from 9/11 in terms of good will from across the aisle. That later turned into "WTF" when he invaded Iraq, but that's on him. (And, for the record, I initially supported him in Iraq until I learned that the justification was BS.)

Obama never played the race card. Some of his supporters did. However, you can't deny race was an issue. I recall interviews at the time with "common people" who were saying "I can't vote for a black man for president". They weren't even sheepish about it. They said it flat-out. In that case, yeah...I'll flip the race card. But as far as his policies, that was strictly partisan/ideological. The Reps didn't hate the ACA because he was black, they hated it because it benefitted poor people. And I don't think Obama (or his administration) ever claimed otherwise.

If Trump is pardoned after being convicted, expect riots. If he wins the general legitimately, there will be a lot of heads exploding (including mine), but I wouldn't expect any widespread riots. Lots of complaining...for months. And calls to end the electoral college. But no significant riots.

If he loses (which I think likely), expect another Jan 6 event(s).