I too wonder about a few things in the video, and also things possibly unseen:
There could have been some interchange beforehand, and that might put some of the culpability on the SUV driver.
It does appear that the SUV did not make a very good effort to slow quickly. But it was slowing, which sort of indicates the driver saw what was happening but either could not, or did not want to hit the brakes any harder to prevent the collision.
In the video I cannot see if anyone made any threatening actions or gestures toward the SUV before he accelerated relatively wildly, which was what caused the most grievous harm. Did the SUV driver panic at that point, or were they already intent on causing him harm? That still needs to be determined, I think.
Clearly, once he ran over the legs of one of the bike riders this infuriated the riders and there was clearly intent to harm after that point (by the hooligans), but maybe all of that could have been avoided if he didn't accelerate away?
Hard to say.
As for a fair trial, you make a great point. We here are all motorcyclists and come with our own biases in favor of motorcyclists and yet we are (mostly) condemning the hooligan bike riders. I'm sure that the lawyers will try and exclude anyone who is an avid motorcyclist. How do you imagine Joe and Betty average American non-motorcyclist will feel about all of this?
I'm not sure how they would be able to exclude the video evidence since it was lawfully obtained from the ***** hooligans who willfully posted it in the public domain, albeit only for a short time. Once implied, that permission cannot be undone.