Not argument, discussion.
I do have sympathy for folks who get injured through no fault of their own. If the girl on the amusement park ride had stuck her leg out somewhere she was told not to, no sympathy. But that's not the case, she was injured through a mechanical malfunction of some kind.
If you want to sympathize with folks who got themselves injured that's fine, I choose not to. You may call it harsh, I disagree.
As for what happened, and who could see who, its hard to say. Heres the street view looking up the roadway from that stop sign.
Google Maps
So, you can see up the road for a little distance, maybe about 1,000 feet before the guardrail obscures your vision, at 80 that would be around 10 seconds, so he should have been able to see the biker. Was there intervening traffic in the slow lane that chopped that distance? Or was the biker doing 90? If so, thats 132fps, or covering the 1000 feet in 7.5 seconds. Combine that with a car in slow lane obscuring the biker til say 500 feet out, maybe the driver didnt have enough time to see the biker. could be he saw him, and did what a lot of drivers do when it drops in the pan, just locks up. We just dont know.
I will say road rash is preventable, though.
We don't have all the facts, so saying who is at fault just doesnt work.