We live the first 18 years of our lives under the supervision of our parents. We follow their rules and they teach us the things we need to know, so when we go out on our own we can not only survive in this world, but hopefully thrive as responsible, productive adults. When a person grows up and leaves the nest, their parents no longer make the rules for them. The strings are cut and it's their turn to make their own decisions, good or bad, and take responsibility for themselves. That's what being an adult in a free country is all about.
I don't know about you all, but I'm an adult and I take responsibility for my actions. I don't need, nor do I want the government to step in and play mommy and daddy for me. Our government is not God or the all knowing man behind the curtain, it's made up of people just like you and I. They should no more be allowed to punish me for not wearing my seat belt, than my parents could. I do think it's the governments role to educate people on things like the safety behind wearing seat belts, but that's as far as it should go.