In the Self Defense and the Law section we discuss “Use of Force”
You are right, it is a heck of a thing to do It is a heck of a thing to bring violence on any person. If you think about it outside the conflict it should not give you a warm and fuzzy feeling.
In training we focus on your will to live and your right to survive. That’s how you handle it. I know I could put some psychology there, but that’s about the size of it- I have a habit of making things as simple as possible.