There's a reason that all the dinosaurs without helmets died out.
I have a friend who used to wear a half helmet with a "Helmet laws suck" sticker on the back. After an accident and a 3 month hospital stay he decided that full face helmets weren't so bad. As it is he would have likely died without the half helmet.
As a bike rider myself, any person who rides a motorcycle without a helmet is a moron.
And I admit, I sometimes ride without one. So I'm a part-time moron.