Orange Joe is correct.

(1) A lawful shooter employs deadly force to put an end to the attacker's deadly force. At the point one is forced to employ deadly force, the outcome (wound or death) is a concern for later. Seconds or minutes later, perhaps, but later.

(2) You shoot for center mass because that (A) is where you have the best chance of hitting an individual in the hyper-stressed moment and (Aa) center mass has the best collection of vital organs/nervous system components likely to incapacitate the attacker and end the actions that forced one to employ deadly force in the first place.

(3) In many locales, deadly force can only legally be applied to protect life, not property.

Where did I learn these tidbits? From reading (including Ayoob) and from police instructors, at least one of them a survivor of a gunfight.

Finally, appreicate the low-cost, sincere, well-intended and generally useful training available from NRA instructors, but don't confuse them as a group with full-time professionals ... either in law or weapon handling.

I can tell you that you don't have to be a lawyer, a cop, a crack shot or a mental giant to become an NRA instructor. Heck, I took all the training and was certified at one time to be an NRA instructor (pistol, rifle, safety). Enjoyed it, learned a lot and glad I did it, but the simple truth is, it really doesn't make me an expert on much.