Don the brains of young people are far more prone to concussion than you understand.  There is already enough evidence to ban football in young children.  You are correct that a person, especially a child, can get concussions from virtually any sport.  All Lacrosse players in reputable programs do wear helmets already.  Yes it is a rough sport and concussions can occur but they occur less frequently than in soccer where heading is part of the sport.  Helmets currently are being resisted in soccer not Lacrosse.  

If we quit glorifying football to young children, perhaps this will go a long way in encouraging other more interesting and less dangerous sport and perhaps there will be less fodder for the NFL....