Yes, if a man is trying to KILL you, by all means, just "wing" him.
That way he can go to prison, where the rest of the inmates will further educate him and he'll do a better job on you, or someone else, the next time.
This is REALLY simple. If you are forced to draw your weapon, it is because there is an imminent threat to your LIFE. There are any number of reasons that you are taught to fire at the K5 zone, center of mass. It is the largest and easiest area to hit, it is the area most likely to stop the threat, and on and on, ad infinitum.
ANYONE stupid enough to think, in the middle of a gunfight,
"I'll just shoot him in the leg, or better yet, in the arm, and make him drop his weapon'', is going to get killed. It's that simple. The real world ain't Hollywood, and you ain't John Wayne, Tom Mix, Samn Elliot, or Steve McQueen.