[rhaphazard]

I don't have first-hand, or even second-hand experience of war. I can only go by what I read in articles like this.

But logically, the author is making a lot of sense. Any apathy or desensitization to killing is either a result of social conditioning (sociopathy) or a psychological predisposition (psychopathy). There are of course other ways this could come about, and the author's 80% figure is probably an over-estimation, but I think the proliferation of military contractors really increases the chances that what the author says is true.

I wonder if there has ever been a study that tries to figure out how prevalent these kind of issues are.

Kids are going to have a hard time unlearning the fake reality presented to them by video games.