Mr bigt8261: Since you are a trainer, you know better than anyone just how unskilled the average human is when it comes to tactical shooting skills. It's just not something we're automatically good at. So, if we want to be that "good guy with a gun", whether in self-defense or in defense of others, we have to train up to it. We can't just "hope" that we'll be good at it. We won't be. It takes training, it takes practice, it takes muscle memory, and most of all, it takes a mental attitude where you're prepared to KILL someone.
If you want to run a marathon, ride the Tour de France, walk the Appalachian Trail, be a chess master, cook like a blue-ribbon chef, or speak Portuguese, you don't just "do it". You'll fail. You get instruction, you practice hard, and you become aware of your own limitations. In the case of firearms, we are dealing with potentially taking a life. We need to get it right the first time.