In the many many years of riding bikes, I have yet to ever see a bad head injury or really any kind of head injury. I have seen lots of skinned elbows, skinned knees, skinned knuckles from riding too close to a fence or a wall.
Poor excuse for not following the campground rules. In the many years I've kayaked and canoed I've never drowned, but that doesn't mean it doesn't happen.
It's simple-if you don't like the rules, don't stay there. Not up to us to question the whys. If the rule is there, it's there. Either abide by it or don't stay. I guess I just don't understand the constant fussing over rules. It's not like there's only one campground in each are to stay at.