You are wrong in so many ways, it isnt even funny. It's even what we are told in the COncealed Carry class. When you are actually scared for your life, you will just keep pulling the trigger. And yes, you do shoot to kill. If you do not kill the person you are shooting, you will get sued big time by them, and they will usually win.
I am sure I am younger than you, and have been shooting guns a lot longer than you.
If you are thinking about just pulling the trigger once, you aren't really scared for your life. When a person is truely scared, they won't have time to think, therefore, they empty the clip.