Lets see if this simplifies and encompasses what we are all trying to say:
War obviously takes a physical toll on people. If you aren't strong and don't have proper supplies/protection you get hurt.
You just have to figure it takes the same mental toll on people. If you aren't mentally fit and you don't have supplies/protection you get hurt. Sometimes, just like physically, you get hurt no matter what.
I mean, War - been there, done that. Wasn't that bad for me, but I'll tell you right now, it changed me. And I'll tell you I was a different person while I was down there.