That may well be the case, but assuming a ball is coming back at 120mph and after the delivery the pitcher is 57 feet from home plate the ball will reach him 0.32 seconds. That is three tenths of a second to realize you are about to take one off the bean and be able to either move your head or get your glove up...almost impossible to do - especially if you have an exaggerated followthrough. I had not considered 57's theory of the helmet not being steady on your head and shifting but I do think they could come up with something. Not saying this is something they should do but I just thought it odd that they make the batter and baseline coaches wear one but not pitchers since they are the closest to home plate (aside from the catcher) and have the highest chance of getting hit in the head with a line drive. I do believe that has happened at least once this year in MLB already and maybe back in college this past season too.