In 2009 my sister in law shot a man attempting to attack her in a parking garage. He was armed with a screwdriver. it turns out he had committed two prior assaults. In the first one he was left off with probation, the second one he left the woman half dead and paralized but that he was the perp was not known until DNA tests shown after my sister in law shot him and had him arrested.
Not only did she prevent a crime against herself she likely prevented future savage assaults and possible murder by the perp.
She only shot him once, that was enough to severely injure him, but like 9 our of ten gunshots it was survived. That said she did have to be 'ready to kill" because you must shoot the person (warning shots that harm anyone else put you in prison) center mass