I have been in the life and death choice situation to many times, sometimes, flight is the best course of action and sometimes fight is the best course, and I hope NONE of you are ever faced with that choice, even killing a sworn enemy of your nation who is trying to kill you, is not easy and you will remember it for the rest of your life, I don't want to have to face that choice again, it is not fun, it is not cool and you will be affected for ever.
I will always till the day I die, be prepared, but I NEVER want to pull that trigger again.
In general I doubt any civilized person WANTS to being a situation where its kill or be killed...
But I'd rather be on the winning side.