A lot of parents and safety advocates say that kids should wear a helmet in don't wear helmets tend to keep their heads up and away from contact, while helmeted players tend to drop their head and lean forward, and are more likely to put themselves in harm's way. Helmets don't protect as much as people think. Helmets blunt the actual collision - but the brain still slaps against the inside of the skull, which is what causes a concussion.Studies of other sports show that safety equipment brings new dangers to the playing field. After helmets were adopted in the 1970s, professional hockey became a lot more vicious, and helmets and facemasks made football players feel so invincible, that head-to-head collisions are now commonplace.