I believe the car was legally at fault, but that the biker shares a good deal of the responsibility.
There's a lot we don't know. What's the speed limit? Is the road straight or curved on either side of the video? Are there any visual obstructions?
My first reaction was that the bike was going way too fast, but upon reflection I'm not sure that's the case. If I had to guess, I'd say that the speed limit on that road was anywhere from 25-40 MPH, and most likely 30-35. Jenner and I independently estimated that the bike was going about fifty feet per second, or around 35MPH. I think it's likely that he was speeding, but not as egregiously so as I first thought.
I don't see evidence of any reaction on the part of the biker. He doesn't seem to brake or swerve at all.
It seems like the car slows down and drifts over the line for about three seconds before the collision. That's not a ton of time, but it certainly would have given him time to slow down or swerve. He might not have been able to stop cleanly, but I think he could have lost at least half of his speed. Even if he wound up dropping the bike and sliding after that, he would have been in better shape than the likely outcome of that aerial cartwheel.
"Tell it to god" is sort of the way I look at it. Other people will fuck up, but it doesn't really matter how wrong they are... you still have to take responsibility for yourself. "I'm not really dead. It was his fault!"