sure, but if a helmet makes things even safer by all means lets mandate helmets in cars. I want people to follow that safety logic to the end.

Who here is saying helmets should be mandated even for bicycles, let alone cars? Why are the only options "pursue safety to its absolute maximum" v. "don't pursue it at all"? Why can't that decision be left to the individual rider, rather than forcing riders to forego safety equipment for astoundingly-lissencephalic rationale like "helmets reduce safety"?