Thinking a .12, give or take, edge in getting a shot off means much on the street, when a shot dead to the heart can leave the bad guy with 15 seconds or more of oxygenated blood in their brain to do with whatever they want tells me people haven't thought the whole problem out.
If one's safety counts on having that .12 second worth of time, then their tactics are horrible and they have set themselves up for failure in a very bad way.