As I found out 2 months ago after being issued a failure to wear a seatbelt ticket while riding in the backseat of a taxi, seatbelts are not required for any occupant over 18 years of age while riding in a taxi, at least in NJ.
At any rate, when I am driving a car, and 99% of the time as a px, I put my seat belt on as soon as I get in the car, not because its the law, but because it was what I was raised to do, and its now become second nature.
I dont think cops should ever go easy on people without seatbelts....If you are in a state that requires a belt to be worn, and you are caught without one, then you broke the law, and should pay the price.
Like I said in the Michael Vick thread..."It doesn't matter if you support or are against any particular law. If you are caught breaking it, there are a series of penalty that you will face. We all know laws are no means of deterrence, so essentially there is nothing to stop you from wearing a seat belt in this example. That said, don't complain when you are pulled over and given a ticket for not wearing a belt, when your in a state that requires it. Right after the cop drives away, feel free to knock that uncomfortable, experience tattering, potentially lethal during an anomoly seat belt off, but just rememeber. When they pull you over again, you have no right to complain. You knew the law, and you broke...So you pay the price for it.
And by the way, my dad NEVER wears his belt, and I tell him he's a jackarse for not doing so. =)