Death row is full of people who shot convenience store clerks after robbing them.
Amen. That's why I chuckle when a board commando, who's never been in that situation, suggests that YOU should wait "until you think" you're about to be harmed before offering resistance. And they they proceed to tell you that means when you have a gun pointed at you and are told to get in the back room, on the floor, and so forth.
Just my thoughts on the matter.