Where is shooting the foot/leg rather than in the chest? This wasn't a gunman that was a danger to everyone in the area; it was a 15 year old girl. If she got shot in the leg, she would have stopped, and the cop could then diffuse the situation.
The only people who ever say this are people who have never shot a gun. It is not remotely realistic to shoot someone's moving limb from any distance. Cops (and everyone else for that matter) shoot for the center of mass, because it gives the best chance of actually hitting somewhere.
Also, shooting someone in the legs could kill them. Not as likely as a shot to the chest, but there is a real chance of bleeding out from a shot to the leg.
