Safety equipment merely raises the bar on what risks people take. We like a certain amount of danger. When you reduce the amount of danger involved in a certain activity, we increase it again by doing the activity in a more dangerous or extreme way. As soon as you give a helmet to someone, they'll feel free to endanger their head as much as before, safe in the knowledge that the helmet will turn deadly activities into merely disabling ones.
Mokalus of Borg
PS - Unless they're a teenage boy.
PPS - In which case "risk" is not yet part of his world view.