Statistics are useful only up to the point when skull hits the concrete. Passengers in cars have a steel cage and (sometimes) airbags, pedestrians are not speeding at 30 k per hour with cars inches from them. Helmets might do little more than let your head bounce before the concrete grips, but I'd rather bounce once or twice, thanks very much.
Yes black and white advocacy sucks, I don't want to see that. I don't want to see local police enforcing helmet laws.
I also don't want to have to support the kid, now an adult, from next door who drools and can't work because he fell off the sidewalk on his BMX 20 years ago and banged his head.