The whole thing is sick and stupid, whether it's adults or children (but especially children). A real fight is over in a few seconds, with blood and eyeballs on the floor and someone dead or grievously hurt.

There are a number of questions here, not the least of which is that of TBI.

I am currently reading "On Killing" by David Grossman (LTC, ret., ex-professor of history at West Point, and creditials both military and academic a mile long). In it he makes some DAMNED GOOD points about how we desensitize our children to violence. I completely and without reserve recommend this book. (Oh, yeah -- it's on the USMC Commandant's required reading list for offficers, among other things.) It'll make you think.