[font='times new roman'][size=3]Unrepentant killers are psychopaths
That's a civilian born misconception.
Killing in and of itself is only a moral recidivism because society at large has little use for it. Battlefields are obviously differing in that regard, its a place where if you don't kill others or yourself may die.
That kicks that whole shtick about the whole concept of killing into a rather alien light to most folks, even then you have few bother making distinction between combat and elsewhere.
But as I said, I know five people personally who have killed more then their share of enemy combatants and their psychological state is well within non sociopathic and psychopathic levels.
It's perspective, well some say justification but that's more or less the same thing.
So ultimately I'll say just this.
Killing people can become just part of a job. Like lifting up a box to a shelf