Pedantic hat on.
"Shoot to injure" is exactly what we do.
We shoot to injure bad guys to do enough physiological or psychological damge to them to make the the bad guys stop their actions. Sometimes we have to do so much damage to stop the attack that the bad guy dies. Sometimes we just have to do minimal damage to stop the attack.
Shooting someone, whether justified or not, is always lethal force. So, even when Double Barrel Biden says, "Choot 'em in the leg!" that is lethal force and the person may die. Shooting someone in the leg has the same legal consequence as shooting someone in the chest, yet may be less effective at stopping the attack.
I know you all know this, but someone might find this thread and learn a thing or two.