January 6 was mass political violence, and I my unprofessional opinion is that the pardons marked a turning point in how engaging in political violence is viewed; all is forgiven if/when your team wins.
Hyper-partisanship, and choosing not playing by the rules when it benefits you will be America's downfall. At some point, people on the other side of the political fence stopped being seen as opponents,but became "enemies", I think cable news/entertainment shoulders much blame on this, but the politicians themselves know outrage turns out the vote. I wonder if they'll attempt to lower the temperature or raise it further.
There has been widespread discontent for a while now - it's the vein Obama and Trump tapped to win their respective first terms. AFAICT, it is an evolving class war[1], with American characteristics.
1. One could argue which side tore up the social contract first, and quibble with the definition of what counts as "violence"