As an interesting side note to this converasation, while I was in Europe last year at a NATO LE Training Conference, I had a long conversation with some Dutch Police on this topic. They are "required" by policy to shoot to wound before shootnig to kill. In their culture/vernacular/law/policy there IS such a thing as shooting to wound/stop and it is defined differently from a Lethal Use of Force.
What's even more frustrating than the existence of such a policy is that they don't train it... they shoot center mass for all of their training and qualifications, but they are told to shoot the legs first.