I heard a good comment on the radio that said that although Obama thinks football is too violent for a son of his, but military combat is perfect fine for a daughter of his. Nobody is forced to play in the NFL (or to compete in the X Games like Caleb Moore). There is a risk of injury in most sports. If you as parents don't want your boys getting hurt playing sports, have them play chess or bridge!
And on that note: GO RAVENS!