First rule of cycling: assume drivers don't see you.
I'm not blaming the cyclists here, but the reality is that when you are cycling it doesn't matter whose fault it is if a car hits you. You're still dead.
While I don't discount that there may be freak scenarios, as a motorcyclist I agree. If I don't see a car, a pedestrian, a bird, a kangaroo, a log on the road, I go to hospital. It's as much my responsibility to ensure my own safety as anyone else's.