Let me say off the top that I wear my seatbelt religiously and thus don't really have a dog in the seatbelt legislation fight. However, I cannot for the *life* of me figure out how not wearing a seatbelt endangers anyone else's life. If someone wants to be stupid and engage in reckless behavior that only endangers themselves, go for it.
Mega dittoes.
It's the insurance lobby. They want you to pay in but, they don't want to pay out. Hurts their bottom lines.
Air bags was pushed by insurance companies. I believe just about everything having to do with driving restrictions is directly related to an insurance company.