SOME POINTS.
First, a defender may be able to sucker punch the guy when he doesn't see it coming, but this guy has already assaulted you or you wouldn't be drawing a gun and preparing to kill him. A good draw time is two seconds. a draw time from a completely unaware status is going to take a lot more time. Anyone can instinctively duck a defender's poking muzzle in his face with that time. An armed attacker can absolutely hit you in the gut with a bullet before you can put a bullet in his head unless you are a champion gunslinger.
Here is a very simple fact. Unless the defender is highly skilled several rapid instinctive hits to the chest can be made before a single aimed round can hit a disabling part of the brain. A single aimed round fired at the brain is going to be far slower than the guy who already has a gun in his hand aimed at your belly. A defender can literally unzip a guy from sternum to throat in less time than it will take to get an absolutely certain shot to the brain or spinal section of the head.
If a defender gets the first rounds in on an armed attacker, there is a chance that an armed attacker can still fight back and kill the defender. Sure, a defender may be so incompetent that he can get the first round into the target at arm's length and still fail to disable the attacker. If the defender fails, he was either outclassed completely or he failed to follow up on his instantaneous advantage.
Even body armor can't fully prevent a disabling hit. There are plenty of rounds that will penetrate standard vests. There are plenty of places that can be hit other than the vest. Even a shot in a vest that is actually blocked will put a physical and mental shock that has been known to temporarily disable people.
The claim has been made and rabidly defended that when facing an armed and prepared attacker at arm's length, shooting into center torso is tantamount to suicide, while shooting at the head is the logical and most likely to be successful attack, since since (in your words) numerous hits to center torso
WILL NOT DISABLE AN ATTACKER and leave him with as much as fifteen second window of opportunity during which he can still get the advantage over a defender who has already put a number of rounds through the attacker's cp area. You stated this as a solid fact.
a “straight line dump into the chest” will still leave your assailant with the 10 to 15 second opportunity to ruin your upcoming weekend itinerary.
Without any evidence that it is true you are stating as fact that when presented with an armed attacker a person can draw,point (aim) and fire lethal rounds into the brain before that armed attacker can respond, whereas you state as a fact that a defender cannot use chest shots to disable the attacker in a timely manner.
I really don't care at all about your beliefs as I know that they are only your opinions, but
you are declaring your beliefs as facts in a public forum where people may believe that your statements are indeed absolute fact.
Numerous times now you have declared that you are experienced and well trained, and said that other trained individuals disagree. You talked about old timers (clint smith, massad Ayoob I guess are old timers) who mumble nonsense into their beards.
Before anyone should even consider giving your statements anything but disbelief and disregard, show us all who you are and what your qualifications are. You're stating widely discounted tactics as facts and dismissing the tactics that have been in use for centuries.
Show us anything that proves that you are qualified to be teaching these people to ignore training and advice given by literally thousands of professionals and semi-professionals.