'Sociopath' has become unfortunately loaded word. I certainly don't think of a serial killer or sadist when I see that term, but rather someone who is emotionally and socially detached from their surroundings, out of ongoing necessity as much as anything else. It's callous indifference as opposed to cruelty, just as people who work on industrial farms and in slaughterhouses are acclimatized to their rather unpleasant jobs, as opposed to hating animals or glorifying in their suffering. The sociopathy described here is the mindset of 'nothing personal/just business' taken to its logical conclusion: one might say that the US has a comparative economic advantage in the projection of military power, this military contractor is essentially one of many service workers to whom we (as society) have outsourced some of our morally unpleasant tasks.