This whole "think of the children" is getting out of hand. I remember growing up climbing trees, using a tall spiral slide, and playing on monkey bars. Could I have gotten hurt? Sure, but scrapes, bruises, and learning how to fall is a part of growing up. If you remove all possible ways for a child to develop his motor skills and learn how to deal with an occasional "oops" when they get hurt, we are going to grow up with a bunch of kids who prefer to sit out of sports and other social events.
This is life, shit happens. People can get hurt and or killed at any point in their life. Banning sports balls is not the answer.