Nowadays, kids aren't truly "mentally" ready for boot camp. They think they are because they are "keyboard commandos", but once reality hits them in the face and/or gut, their eyes are opened and they realize that no one there is going to do anything for them. And, they are on their own...mom and dad aren't there to take care of their booboo's. No one wants to hear their griping or complaining. They are expected to act like adults and not whiney kids.
Nope...many simply aren't ready to be "big people" yet and can't deal with it.