I was actually using the trope you reference as an allegory. The article I derived it from is:
I disagree with your assertion that we dehumanize the enemy just as much as they do. I’m sure some of our troops do, but our thinking is, in general, completely different than theirs. They see us as kafirs, lower than believers, less than humans. Short of true psychopaths, few Westerners can muster up the same kind of rationalization for killing another person. Dr. Keith Ablow wrote a pretty good article on it: http://www.foxnews.com/opinion/2014/08/21/inside-mind-james-foley-isis-executioner/. Violent criminals here in the States generally fall into the sociopath category.