I cant say for sure what the Genesis of this conflict was, so I don't for sure know what I would have done. If it was a perceived slight from the bikers that escalated as it did on video, because the guy did something they thought merited that annoyed biker response, we all like to talk about on PNWriders, He is justified.
If he stood his ground in traffic, and the bikers didn't like that, then he had some role to play in the escalation. Personally I try to acquiesce to folks doing stupid on the road and give them plenty of room to do it. Having said that, I do occasionally piss people off by maneuvering heavy traffic, I wont run over someone, but there are those times where you have to be assertive or you ain't getting over, or I just don't see them -_- It's hard to admit, but it does happen even though I am an official PNWriders Superbiker. In this scenario, I would try and escape the situation, if I were unlucky enough to find myself in it in the first place. This is what I believe happened, and because the bikers pursued trouble they found it. One guy may not be ambulatory for the rest of his life because of the mob mentality he allowed himself to be swept up in, pending legal issues add insult to injury.
If the guy was an aggressive douchetard toward the bikers, then it's a day when many fools met and got more than they bargained for. If he picked the fight, if the guy in the Rover was the initial aggressor, He is not justified in running bikers over, or shooting them. do you defend you family because it got out of control? Yes, but then you have to face the consequences of placing your family in that situation and using overwhelming or deadly force to escape it.
It's a really fine line, there are a lot of facts because of the video, but not all of them, so there are a lot of hindsight judgments you and I can make. I would not want my fate in the hands of Witnesses, Law Enforcement, Jurors, Prosecutors or Judges, if I had the option to not be in that position. I don't believe the driver of the Rover was of that mindset.