Why cant we be free to have what we want on our cars
Well, there are reasons to have equiptment laws. If some people had red brake lights, and other people had blue or green brake lights, that'd be a safety issue. Same thing with tint... 5% in the front raises a number of safety issues.
That isn't to say many laws aren't trivial. Does someone want to tell me why I can't install HIDs on my Celica when they were a factory option?