I watched this a couple of days ago, just randomly popped up in the YouTube feed. It's pretty outrageous how the Vietnam veterans were treated, and unfortunate the lack of help they received on the mental health treatment.
That said, Veterans have been doing this for years, from all wars. War is going to change you, some people can deal with things and some cannot. If my wife would let me move her and the kids to the middle of nowhere, I'd be packed and gone tonight.