We deal with that in combat, as well. We have shot kids who surprised us in the heat of battle with what looked like they were armed, they weren't. We were cleared, as they said 99 out 100 Marines would have pulled the trigger. It doesn't matter if you are cleared. Of all the Marines I have lost, all the fire fights I have been in, hit by IEDs, rocket attacks, etc... nothing hits PTS harder than taking an innocent life.
Damn bro, I cannot imagine.