Did you see the videos? The ones I saw showed that the white vehicle may have been the reason for the collision. It seems the bus changed lanes, the white vehicle wanted to stay behind it, and the truck wasn't having it.
As far as harassment goes, Trump supporters didn't invent that. People of all beliefs have been using that forever. The left is especially good at it. Watch Ben Shapiro try to speak on a college campus.
This is pretty much exactly what I was going to say.
The white Subaru moved left and the truck moved forward right behind the bus. Then the Subaru tried mov ij ng back behind the bus but because there wasnt any room the Subaru instead decided to try to force it's way in driving way over the line into the trucks lane. I couldn't see what exactly happened, but at the time of impact the Subaru was driving way inside the trucks lane.