Think of all the blown elbows and knees, broken fingers, forearms, and collarbones...I can't imagine why any parent who claims to care would even let their kids play football!
I'll let mine play. To be honest, I caught in baseball from the time I was in 9-10 little league until I graduated high school and I have a lot more problems from that. Kids are fat and lazy already so I'm all for a sport like football. I played and in all honesty probably started too young but, it taught me a lot of discipline and the ability to work as a team.