Good point. The taking of a human life, no matter how justified, is usually pretty hard on the life taker, if he or she is normal. I hope the officer gets the help he needs to be able to carry on with a normal, healthy life.
Well, I would think that a sniper is not a "normal" person to begin with. Normal people don't have the fortitude to even consider placing themselves in that position. I think a man or woman in that position is rather extraordinary.