When violence occurs, both sides are quick to blame a few bad actors. Even when it was clear that everyone was spoiling for a fight.
The frustrating thing with Trump is that this didn't have to be so hard. It's very easy just to say, "we can't have people driving cars into crowds who disagree with them. That is completely unacceptable. We are better than that". He didn't have to get involved with the politics at all. But he is just such a complete asshole that he can't help himself.