Maybe you've missed ALL of the statistics I've noted?

Firstly - in minor accidents in which a helmet is likely to be ABLE to do some good barely 25% of them involve even a minor conk on the head.

As for your friend going through a windshield - I SAW a man on a motorcycle hit a car at high speed and go through the windshield. He killed the passenger and cut the hell out of himself but head injuries were almost nonexistant. He wasn't wearing a helmet since they didn't exist at that time.

You can't pretend that a helmet helped and you can't KNOW that it didn't. That's part of the problem and the only way we can assume anything is by using statistical analysis and unfortunately that shows that helmets seem to have IF ANY, only a minimal effect in a serious or fatal accident.