That's one of the reasons soldier get PTSD or are/were drugged. There must also be a component of getting used to it at some point, but several people who kill

That's one of the reasons soldier get PTSD or are/were drugged. There must also be a component of getting used to it at some point, but several people who killed someone (often with the sponsorship of some country that can socialise the cost of war) found their first experiences to be traumatic.