It proves that our screening process is not stringent enough and sent psychopaths into hostile countries while we're supposed to be in peacekeeping mode.
There are situations that need psychopaths, and there are situations that need sociopaths. Send in the wrong kind in and we get major problems, such as this case.
Major Hassan's massacre a while back was a signal that psych care wasn't not enough in the army. They raised it up a notch, but looks like it's not enough. Add to the part about soldiers being macho guys who are supposed to suck it up and keep it in, and you get crazies.
Best spin control? Add Afghan advisors / observers to the trial.