You would be stupid going in for a kill shot. Any human being, ANY human being that isn't hopped up on drugs would stop running if you capped them in the leg. If a bat can do, a bullet can do it. And not to mention you haven't murdered the guy, he's laying there in excruciating pain because you just destroyed his god damn shin bone, He's immobile and he's there for the cops now, instead of letting the man run off and do it again to someone who's more helpless than you, take him down right there and now.

Also it just so happens stabbings, brutal beatings, and downright getting pushed into oncoming steel is more common than some guy robbing you at gun point. That shit is unlikely, It's knife point that you should watch out for, I had it happen to me more than a couple of times.

Also have fun running from thugs who out run the police once a week. That shit is hard. They may not have endurance, but they mostl likely have enough speed to catch you before their shitty tobacco lungs give in. Sometimes you just got to stay and fight with a Weapon.