IMHO: Everyone should make his own decission: wearing a helmet or not. It's for his/her own safety, not for others, and therefore it's redicolous when someone gets a penalty from a cop when someone's not wearing a helmet. Personally, I don't wear a helmet when riding a bike, though I know it would be safer with helmet.
The same applies to wearing a belt (what's the English word?) in a car. It's not for the safety of others, but for your own. It doesn't make sense to force someone to do something for his OWN safety. If it would be for others than I would totally agree, but it does NOT.
Maybe it will be forbidden to get out of your house in the future, as so much could happen when your out of your house.