Lol. What video did you watch? As a former rider, I saw this entirely differently.
Biker caused this with his brake check. Video also demonstrated that bikers were stalking suv before accident. Suv even stopped after accident, only to have rider attempt to drag him out of the vehicle. He was justified in fleeing for safety.
In the guy’s list of videos, the one just before the violence shows what looks like it could be the SUV coming onto the freeway and merging nicely with the motorcycles. The video guys looks over at it a few times, and seems to raise his hand, point a finger.
http://www.youtube.com/watch?v=Yd1_9Gvj8qA