Why not? The whole point of the exercise is to make sure the little creep can't do any more damage.
If I thought this was a bad shoot I'd be all over the cops. I don't think this is one of those cases.
Her “baby” had 4 bullets in HIS gun. If 1 is enough for the cops who suddenly have a thug pointing a loaded gun at them why would he her “baby” need more than 1?