Many people ask why the police don't shoot the leg of a perp charging a cop. In a hostile environment, the best method for stopping the attacker is to aim center mass. Even the double tap and one to the head requires lots of practice. Most cops go their entire career with firing their weapon. Some say that war veterans make better cops because they know better for when to draw their pistol and when to deescalate the situation.
Also, I remember our Drill Instructor in 86 telling us the 5.56 bullet will tumble once it hits flesh and causes a massive wound channel. Now I understand it to be a Vietnam myth.
This is FJs post so forgive me if I'm off topic.