Chain : And OHOH, I'll disagree that riding sans lid feels good. Something about catching bugs in your face at speed and not being able to hear after the ride's over turns me off, and that's assuming I don't hit the deck and turn myself into a veritable vegetable who eats his meals through a straw.
M'kay... well, most who ride without gear are on cruisers, doing an average of 35mph, not enough to go deaf or really get hurt by bugs, but more than enough to split the melon wide open. Besides, if I was really wrong, and if riding without a helmet was such an unpleasant experience, would people be doing it en-masse (where it's legal, and even where it's not)? Didn't think so
Me, I'd ride without a helmet at lower speeds (say, 45mph and below) if the downside wasn't so horrific. Our evolution made us capable of likely surviving, what, a 10mph head impact, maybe a little more. Anyone that rides above that physiological limit either needs technology (helmet) to extend our natural limitations, or does so risking their quality of/life (I will, however concede that many of those play the odds not fully realizing the stakes).
I disagree with the choice that so many people make when they don't wear helmets, as I disagree with many other choices/things, but it still won't make me think that those I disagree with are dumbasses for choosing differently than I would (at least in the case of helmet wear; someone choosing to read a magazine in their moving SUV while they're driving it is, of course, a dumbass, and little will convince me otherwise )