You don't wear a helmet inside a car because you have what's known to those of us who ride as a "cage" surrounding your melon, so that point is kinda out in left field. Sure, wearing a helmet inside a car would probably save a few who died from head trauma, but would add a bunch more from drivers not being able to hear oncoming emergency vehicles, or the semi blasting his horn at them as they deafly pull out in front of them.
I wear full gear, known as ATGATT, all the gear, all the time. Sure, it sucks in the heat, and it's a pain to take off and put on all the time, and you need a bag or a somewhere to store it if you are riding in to work or anything similar where you need to wear "civilian'' clothes once you arrive. But after just one case of severe road rash on a leg and buttock, you tend to think it's not so bad taking the time to gear up. Sure, if you're a bachelor with no dependents who rely on you and no one will miss you when you're gone, head on out there like the squids in their tshirts, shorts and flip-flops... I can't, because I have kids that I still want to watch grow up and maybe give me a grandkid someday, so I owe it to them to use any and every method of protection that I can. Will I stop riding? Probably not, unless it just gets to the point where I feel like nothing but a target out there, or I think my reflexes are a danger to anyone else on the road, but if throwing on a $75-$100.00 helmet on means I get to stick around this crazy world a bit longer, I'm all for it. You can argue the "helmet law-gun control" thing all you want, that's just apples and oranges... might as well just compare the helmet law to income tax, that's just as accurate correlation, government making us do things we don't want to... common sense tells you that it's better to put something between your head and a hard surface, at least for most of us.