I can see both sides of this issue. First, my dad has been involved in 5 auto accidents in his life, and this was in the 70's, when seat belts weren't a priority, and in 4 of those 5 accidents, had he been wearing a seat belt, he wouldn't be alive today. He would've been killed as a result of the accident. On the other side of this issue, about 4 years ago, my husband was in an accident, and had a head injury, and some sore ribs because he wasn't wearing a seat belt. He's fine, and didn't have anything too serious happen to him, but it definitey wouldn't have been as bad if he was wearing a seat belt. Also, just over 3 years ago, I was in an accident, doing only about 20 mph, and I was wearing my seatbelt. I was a little sore, but other than that, there was nothing more serious, other than they totalled my car. I'm still a little pi$$ed about that one. I agree seat belts do save lives, but I can also see the point about not wearing one either.
I think it should be up to the individual whether they choose to use one or not.