Apparently nine out of ten of us wear a seat belt. Can you think of any other common activity that garners 90% participation? If we could get that level of participation in voting, this would be a different country.
Besides, the only one who will be hurt if you don't wear your belt is you. If you drive drunk, you could hurt or kill others.
I don't want young people to die needlessly, but their parents or guardians should be the ones to teach them to use seat belts. As for adults, if they choose to drive without a belt on, that's their lookout and they (or their survivors) will have to live with the consequences. The Highway Patrol should worry about stopping behavior that could harm others.