If the physical abuse went overboard, that is different.
When I went through basic training in 1968 a training cooked off a grenade in violation of instructions and accidentally dropped it. A quick reacting drill instructor tossed the grenade over the wall before it exploded. The drill instructors formed a circle and put the trainee in the center. They passed him from one drill instructor to the other each one punching and slapping him. We all got the message and nothing further happened to the kid after he got his behind whipped. I saw many other things that were worse than what this DI is charged with, and all of it seemed to be geared to making sure that we got the message.
I think that much of the abuse we received actually made us focus a lot better.