joystickjunki3 said:
EDIT x3: I concede that if others are in the car, then my initial argument is often invalid. Not all the time (see my example involving my aunt), but often enough that I admit defeat in that battle. But what if you're the only individual in the car? Most autos nowadays provide enough secondary safety equipment to prevent your body catapulting out the window.
Ah, the old "Change the premise of the argument when it's obvious I've no idea what I'm talking about" guise.
Incidentally, youre belief about what is "enough" secondary safety equipment does not seem to match the prevailing belief of safety experts and the doctors and workers who have to deal with the results. Given that, I think the smart people would tend to believe them rather than J.Random Internet Poster.
Now, let's get to the heart of your question, which is really the old libertarian thing of "Why can society dictate what I do." The answer is because society is a package deal. You like the protections, services, and capabilities that being in a civilized society provides you, you have to undertake some of the restrictions. It's called compromise. Personally, I feel I should be free to take a crap in front of your house. However, because I don't like it when you play Bad Brains at 4am at maximum volume, I agree to the compromise that I won't crap in front of your house if you don't play that music waking me up. If either one of us disagrees with this premise, the other has the ability to call the cops who will then enforce the compromise.
In this particular case, the compromise is that you get to drive, so long as you wear your seatbelt. Society, in general, has agreed that this is fair (even if certain niche groups of society are vehemently against it) so all of us get to live with this compromise.
This is the bottom line to your question. Where does the infringment stop? It stops where society, in general, says that it does. Believe it or not, you're living amongst other people. Part of that means that, gosh Billy, you really don't get to do absolutely anything you want, even if you're not living under mom's roof anymore.
Don't like it? Move to somewhere where there aren't laws or restrictions. Emigration is still allowed, and there are places, such as remote regions of Africa, or certain areas of Afghanistan, where there isn't a recognized rule of law to restrict you. Funnily enough, these places usually suck.