The initial issue came when the first bike brake checked the SUV, to me this wasn't just a car stuck behind a group of jerks, it was almost personal like a bully stepping up in your face and threatening your liberty. The person on that bike tried to take control of the guy in the SUV's freedom. The prudent course, and one most would take would be to stay cool and let the issue diffuse itself, but sometimes the bully gets smashed in the face.
The guy who on the bike who brake checked and got bumped caused this whole thing, he was an arrogant asss who thought he could control another human and disrespected another man's right to his freedom like he didn't matter, he is the main one I would prosecute to the fullest extent. From there I would give assualt charges to those who retailated against the driver, particularly those who used a knife.
For the driver, I would admonish him in court, explain to him he was wrong to panic, and then send him on his way. There is a good chance he will get sued later by the paralyzed family anyway, he didn't started the fight, but he did participate, let that be played out in civil court.
As for the paralyzed guy, I really feel bad for him, no matter how foolish any of these stunt riders were, being confined to a wheel chair for the rest of your life is too high a penalty for being a hooligan. I actually hope he heals up and can be returned to his family and rebuild his life.