Unarmed Bad Guys Running at You
You're taking an evening walk about 10PM and you're carrying. As you get about 100' from the door of a local store, the alarm goes off and two bad guys come out an obliviously kicked in door. It's a well lit area and they immediately see you, but rather than run away, they run toward you.
As far as you can see they are unarmed, but these are big guys and they don't look friendly. They're in a full run coming at you, what do you do?
To use deadly force you need to be in fear for your life or that of another. If you're afraid these bad guys could take your weapon and kill you, then I know I would be in fear for my life.
Law Enforcement officers have a lot more weapons training than the average person who carries a handgun. Yet depending on the year as many as 1/5th of the officers killed each year, are killed with their own weapon according to the FBI.
It's easy to talk and train about taking a life in a shooting situation, it's another to actually do it. I think this static proves that even a well trained police officer can not be prepared to take another's life..
To take someones life is not an easy decision, but hesitation can get you killed.