I agree, the system is very badly designed. Cars and bikes don't mix without carefully designed roads that make the lazy/default decision and the safe decision the same thing, because eventual complacency is human nature.
You could say that jumping out of a plane without a parachute isn't dangerous, it's the ground that's dangerous.
In that metaphor cars are a force of nature. I've also heard "the laws of physics trump the law of man", and "what's more important: being right or being alive". People choose to drive; people choose to cycle; and people choose to walk. When I choose to drive, I have the means to kill someone else and I'm damn well responsible for that risk. After all, the person I hit didn't choose for me to drive.