I'm saying it's doublespeak, nothing more. They say they're trained to "stop the threat" because it plays well to juries in the inevitable lawsuit and it probably gives them some personal absolution in the rare event they have to fire their weapon (I didn't intend to kill that person, I just wanted to stop him).
But the fact remains that the way they stop the threat is almost inevitably by killing the person. Hell, I previously linked to a former FBI trainer's report on the Cleveland police shooting involving the 12 year old, and her words were even starker. Something along the lines of "the most effective way to stop a threat is to prevent oxygen from reaching the decision-making center" or something to that effect. So they aren't trained to kill, they're just trained to deprive the brain of oxygen through blood loss.
To any lay person, that sounds a helluva lot like being trained to kill.