I have 3 helmets that I wear regularly, a commuter with lights, a larger one I can fit caps under for cold weather, and a tighter one for warmer days (so I'm not always adjusting the straps). Takes one second to put any of them on. My hair looks the same after I get up in the morning, after I wash it, and after a 30 mile ride with a helmet (see my avatar, not far from the truth). No reason why I shouldn't wear one.

I don't care if other people don't want to wear one. It's their head. I'm into the freedom to be reckless, if no one else gets hurt.