No one will perform perfectly.
And just like you don't know when and where the next mass shooter will strike, you don't know which students will perform well, which will do satisfactory, and which will fall flat on their faces.
Then add in the ones that never had a chance for whatever reason.
Then add in the ones that run away from the scene instead of towards it. We don't care why; it was a choice and they made it.
And so on.
So the reality is that due to the very nature of mass shootings and those that perpetrate them, the rarity of these events, combined with the lack of "good guys" that just happen to be in the area at that exact moment, that we may never see a significant change in the data towards the "good guys with a gun."
The math, simply speaking, is not in our favor.
But we also know that sometimes events work out in a way where we do have a chance to change the outcome, simply because we are in fact armed.
Training, at whatever level, quality, consistency, etc., just evens the odds a little, or maybe even tilts the odds slightly back in our favor, in spite of the fact that we were taken largely by surprise, in a place and time not of our choosing.
And when you must play the cards dealt to you, and they're not very good cards, everyone wants every other advantage they can get before having to show.
One of the great "hidden" tools we have at our disposal is the internet. These free forums. Youtube, and so forth. The ability to ask questions and get answers in almost real-time. To discuss video. To analyze and break down incidents tactically, technically, philosophically, etc. can make a difference to some of us.
Maybe to most of those of us that end up one day having to draw a weapon in actual combat. Or maybe not "most," but maybe to several of us.
Most importantly, maybe something I learn here or on a video, or in a class will save a life, like mine for starters.
Which, by the way, is pretty much exactly how we do it in aviation. We take real incidents from the recent past and break them down and try to come up with solid plans of action in case such things happen to us in the future.