I have a problem with the “he was running away and thus not a danger to anyone”.
A) does that mean they can never return to do another crime or retry the same one?
B) does that mean no-one else gets hurt during any subsequent chase or apprehension?
Maybe because it's a ludicrous statement. If he's willing to shoot a cop, he wouldn't think twice about harming anyone else if it would aid him in fleeing the scene.