Do Work Son
Go Kart Champion
I didn't wear a helmet as a kid and did just fine too. I've also cracked my helmet during a ~20 foot fall while at the watershed near frederick md. After posting that I was trying to think what mountains you guys have out there, so you're probably right, my bad. It's hard to tell what will happen though, as I've wrecked on flat ground before after hitting a deer, and knowing how to fall won't help you in unknown situations.
There's no good reason not to ride without a helmet, just like there's no good reason not to wear a seatbelt.