I don't analyze things by personal incidents; I was thrown from a 1962 Corvair that flipped from a crosswind and was ejected only to come to my senses hours later around dawn almost 500 feet from the final rest point for the vehicle.
I was told later in the hospital that the car had burned completely after it stopped skidding and rolling.
Had I been belted in, I would have likely died in the flames but that doesn't make me go around arguing that seat belts are dangerous.
My point is that belts don't prevent injuries and often increase them; the notion that all crash injuries are an added burden on society assumes that responders are only on the clock when repairing the damaged victims.
What happens is the fixed costs end up being counted twice when those sort of arguments are made.
Whatever. I know I feel safer when I'm buckled in, and everyone else is, too. I have one of those nifty seat belt cutter/window smasher tools, just in case.