I know there are some authors who advocate certain attitudes or ways of thinking.
I guess my point is that anything that keeps your mind from freezing up with overload and keeps you functioning is good. Any thought process, attitude, emotion or "mindset" that allows you to keep functioning is good - at least for survival.
This lady had a gun pointed at her, was shot at, returned fire - hitting one of her assailants, spotted a second attacker opening fire on her, ducked while the second attacker sent a round through her windshield and put 8 rounds into the front of her car, popped back up and returned fire!
I don't know any experts/authorities/SD authors who say "Just resign yourself to the fact that you're going to die and try to take as many with you as you can."