I watched Bill Maher last night (Ben Shapiro is so goddamn annoying) and he said it doesn't matter who started it. I interpreted that as a reference to the tension and downward spiral in norms and discourse.
The notion is appealing but it's simplistic. When your kids get into a spat about who did what first, that's when it doesn't matter. However, when we have what we have now, it's absolutely necessary to trace things back to identify when the breakdown really took off. If we don't trace it back, we learn nothing and therefore won't have anyway to deal with it in the future (see Nazi Germany, germ theory, etc.)
With respect to who started It, it was Trump who gave voice to what we see now. To one degree or another there have always been ragtag fringe groups on both extremes, but Trump and subsequently the GOP gave all of them a place to coalesce around. The Dems, as limp dicked and ineffective as they have been, didn't give a voice to hate and violence. They've helped perpetuate a lot of problems, but at least it came from a place of empathy, no matter how stupid or foreseeably hopeless it was.
Hate and ineptitude are not the same thing.
If this country ever wants to return to respectability then it has to begin with the right. They had the opportunity and many wanted to be done with the Trump era like it had been a crazy whiskey and meth-fueled weekend in Vegas. It was a fun for a while, but now it was time to go home, but they couldn't get the meth dealer to leave. They're still going and there's no indication that treatment is going to be sought.
Until the come-down hits, if it ever does, they're going to have to step up and take responsibility for starting this shit.
***Note: Yes, I understand that many believe, and I think rightly so, that Japan began WW2 in 1933.