You still haven't made a single argument in favor of emotional empathy, other than conflating lack of emotional empathy with, in order of appearance: Stalinism, Nazism, witch hunting, fanaticism. None of this name calling was supported by any evidence re:empathy.
The argument that I was making or, maybe, just implying is a version of the argument for deontological ethics. It rests on two lemmas: (1) You will make mistakes; (2) No one is a villain in his own story.
To unroll a bit, people who do large-scale evil do not go home to stroke a white cat and cackle at their own evilness. They think they are the good guys and that they do what's necessary to achieve their good goals. We think they're wrong, but that's an outside view. As has been pointed out, the road to hell is never in need of repair.
Given this, it's usef...