Motorcycles have crashes with cars, they move fast and get thrown, bumping a head, breaking a neck, crushing a spine. Bicycles, if you are off the main streets and not being stupid, instead being cautious, if you learn to throw down your bike, etc....I was taught and learned to ride safely, not wear safety.
It is kind of like wearing nothing. You are naturally more aware, more thoughtful, more cautious, careful, mindful. You don't need pants.
I have been bruised, cut, road rash, on a bicycle, but banging a head is difficult. Going head over handlebars is difficult. You have to be doing extremes.
There is law here requiring kids to wear helmets, but not adults. It is incremental. If they grow up wearing them, they'll continue as adults. Kind of like the uniform training for school.
Give me the wind in my hair.
Jbee