It's so easy to fall: your tire hits a rock and skids,you slam on your breaks to avoid hitting something, a car hits you, and (the classic) a parked car opens the driver side door without seeing you coming and you plow into the door and flip over the handle bars. Your head is the heaviest part of your body and it's going to hit the ground first. I just don't understand how anyone can ride without a helmet, even for a "short" ride. And the "fashion" among school age children is to wear your helmet but not buckle it; what good is that going to do when you go flying over your handle bars?
Adults should model safe behavior by wearing their helmets for all bike rides and parents should enforce the under 18 must wear a helmet law. And children must learn that the bike helmet is just as important as the seat belt. The consequenses of not wearing a helmet can be deadly.