I don't know if there is really a solid answer to the original question.
The very first time that I ever faced any kind of serious threat from thugs was back in 1986 when I was robbed at both knife point & gun point by two guys who came into my uncles liquor store in Lake Elsinore, CA. (I was only 17 yrs old at the time).
Even though I had quick access to a firearm at that moment, I completely froze in both disbelief and fear.
By the time my brain had registered that I should use the handgun to defend myself it was far too late for me to do anything because the dude with the knife was allready upon me with the knife to my neck.
I ended up being robbed and unable to defend myself. I was so afraid because I thought for sure that I was going to be shot or stabbed.
Luckily for me the two robbers didn't decide to hurt me in any way and they just ended up taking off with some money from the cash register and some booze from the shelves.
For me, I think that it was that bad experience of being victimized that helped to better prepare me to defend myself in future situations.
I later joined the military and I also did security work for many years as well, so I have also had the benefit of some training.
MARK IT ZERO!
~Walter Sobchak~