This is ignorant advice. Have you ever taken a course on the justifiable use of deadly force?
You don't shoot to wound, you don't shoot to kill. You shoot to STOP the threat. No more, no less. Keep firing until the threat is no longer a threat and then STOP!. If the attacker dies than so be it but that is not the goal, saying anything remotely close to that to police officers after a self defense shooting can land you in prison for manslaughter.
Also you don't aim for the head, especially if you're a beginner. Aim for the torso, center mass, it is the easiest target to reliably hit.
No firearm expert or instructor will ever tell you to aim for the head.
If ya kill the head, the ass has got to die
