Whether we use helmets or not use helmets, the core issue is personal responsibility. Charles Darwin had a theory about survival of the fittest, and I doubt if that theory applies only to the physical aspect of evolution. I see ads for UTVs and ATVs with wild speeds and maneuvers in deserts and forests. Trail riding like that might suggest a helmet might be a good idea. Yet, no helmet or seat belt, or any safety system for that matter, can protect anyone from irresponsible actions. Hit a tree or bury the front end in a gully at speed, and it just isn't going to end well.