The effect on the military personnel of killing, not in self-defense but on the order of superiors, was predictable and predicted. The military was unprepared to deal with mental and psychological trauma because the brain is not an organ subject to physical repair. Still is.
It was a gross mistake to keep the atrocities hidden even after the active combat was supposedly over. That can be laid at Obama’s feet. He chose denial over admission of wrong. Confession is good for the soul, if only because it gets rid of guilt. Guilt is a corrosive emotion. Shared guilt is deadly because it leads to denial and repetition of the bad acts.