My life has likely been saved at least twice by helmets!

My opinion is that kids really ought to wear the helmets-- they don't know much better. My siblings and I didn't think anything of it until one day back in the early nineties my parents brought home a couple bell helmets!

Adults on the other hand? If they're still stubborn enough to go without then they may get what's coming to them. I have friends that have the attitude "When my numbers up, it's up and a helmet won't make a huge difference". Those who go without helmets don't seem to care, I guess.