Then again it could have been the helmet that threw him off balanced and caused the whole thing. Maybe there would not have been an accident if he had not been wearing a helmet. Or maybe if he did crash with out a helmet and his head was lighter he wouldn't have hit his head because he could lift his head out of danger faster.
Hypothetical the helmet saved my life is nonsense, there is no way to know for sure what would happen if the helmet was not on.
Air bags, seat belts, and helmets are no guarantee to safety but even worse they can and have caused injuries.
I don't really see how in his case, his helmet could have caused the accident. I don't know if you've ever watched snowboarding, maybe in the olympics? (hate to change but the subject, this is the last time I promise lol) But if you haven't -- This guy was doing a back flip, and ended up smashing his forehead on the edge of the half-pipe. So try and picture the half pipe, and the angle he hit it at... If he hadn't hit the lip, he probably would have handed on his head/neck and maybe broken his neck or worse. It was freak accident, and I don't think that he could've stopped it no matter how hard he tried. The way it sounds, the flip was wrong right from the take off; there was nothing he could have done. If he hadn't worn his helmet, there is no doubt he wouldn't be alive.
I've had my fair share of saves by my helmet too. My horse threw me into a fence once, and I was completely unhurt because I wore my helmet & vest. My helmet has velvet scratched off of it because I hit the fence; that could have been my head. I once had a helmet break when I was thrown off; again, could've been my head.