A gun doesn't disable. It kills. Maybe it kills inefficiently and the target survives, but you can't consider a gun a tool to injure -- thinking that way will lead you to make wrong choices in how to use violence.

Word up. Don't ever set out to learn a weapons skill or fighting technique and start kidding yourself that you're just gonna disable your attacker. Stick with a more accurate statement that you will never, ever be able to achieve the level of skill that would allow you to control the outcome of a violent encounter to such an extent. It's an old cop saying, "Don't point it unless you mean to shoot it; don't shoot it unless you mean to kill."