They are NOT shooting to stop, they are shooting to kill - instantly.
Listen to Coronach. It's not just a semantic distinction. It's all about what the
goal is. The goal is not, necessarily, to kill anyone. It's to
stop them from doing whatever they were doing or about to do.
If they die, that's just tough. But that wasn't the point. The cops (and CCW'ers for that matter) are not executioners. They/we don't get to make decisions about who lives and dies. Lethal force can be used where applicable, but the point of the matter is not to kill the slime, it's to get them to cease.
This is why it's not legal for you to shoot someone, they fall and drop their weapon and then you walk up and put one in their head. That last shot = murder.
If the guy had dynamite strapped to his chest, it's another story. Is he still a threat?
I'm very surprised, actually, that anyone here who has a CCW or so much as owns a gun is not
intimately familiar with the 'shoot to stop' concept and how it differs from 'shoot to kill'.
This is Self-Defense/Use of Lethal Force 101 stuff here, folks.