>>11349971. Because I road race and USAC rules require helmets.
2. Because I crashed just before the finish of a road race a few years back and if my head had got the huge dent in it that the helmet instead got, I would have had to have been airlifted out to an ER instead of limping back to my car and having a huge hematoma on my left hip for about 3 weeks.
3. I don't need more reasons than the two above. It's your dome, if you want to risk cracking it open like an egg, it's your business, but if it were up to me and you did I'd let you die, dipshit, because you're dumb.