The USMC taught me that (outside of a combat zone) you never unholster your weapon unless your life or the life of an innocent bystander is in danger (or a grave National Security Risk must be stopped). Then, you don’t wave the weapon around to scare the attacker and you don’t shoot to wound. You shoot to ensure that the threat is stopped.
These procedures are designed to prevent a minor situation from escalating into a fatal situation unnecessarily. You wait until the situation requires the use of deadly force, then you apply deadly force.
I don’t have a lot of training, not being military, just a carry permit holder since 2003.
But, I took some good classes that taught if you are going to pull it, you need to use it. Nothing else.