The people who trained those people spent their entire careers trying to work out, and setting the conditions as best they could, to replicate these horrors and not lose.
They have no intention of being caught, tried, and hung. They intend to kill as many as needed to keep that from happening. Fortunately, (so far) the war so far is not trending in their favor -- although to keep with the analogy, it's more like early '42 and not yet a sure thing. (In material terms; in the longer sense Christ will and has already won.)
The people who trained those people spent their entire careers trying to work out, and setting the conditions as best they could, to replicate these horrors and not lose.
They have no intention of being caught, tried, and hung. They intend to kill as many as needed to keep that from happening. Fortunately, (so far) the war so far is not trending in their favor -- although to keep with the analogy, it's more like early '42 and not yet a sure thing. (In material terms; in the longer sense Christ will and has already won.)