Sam, even though it's hard to have a discussion with a made up mind, first YES I have two danglies like you and did super-foolish stuff on a bike and with my feet (jumping off high stuff, roofs and such) did TONS of dardeviling broke spokes from impact, 70's SoCal kid who did lots of running on the dirtbike from the po-po, but what I also did was take martial arts from a young age, the first thing you are taught is how to fall.Second you hit your FACE on the handle-bars not your head, helmet is not going to help you there.So I put this to you, if you and a stuntman do the same stunt who is likely to hit his head, considering we all have to follow the rules of physics?It is because of training and practice that a stuntman does all those UNBELIEVABLE things, you could do it too given you are in shape and practice, it's not magic it's using physics to your advantage.
Though I must say by today's societal standards I'm a bit nuts, here's the best analogy I can muster, a doctor tells someone today "your health is bad you need to change your diet and exercise,... or you can take this pill for the rest of your life" 85% take the pill, I'll exercise thank you,... exercise/diet=general-bike-safety pill=helmet