That is not in fact how LEOs are trained. They are trained to shoot to stop a threat.
Exactly - shoot center mass in the chest for maximum stopping effectiveness and the safety of those in the vicinity - its the best chance of stopping the person who is a "deadly threat" aggressor... if they are lucky enough to live GREAT, if they don't that is simply a consequence of their actions that caused the officer (or us) to shoot them in the first place.
The shoot-to-wound mentality has all sorts of philosophical problems.
Simply put - if the threat is severe enough to shoot at all, then killing the aggressor is justified - there are no "levels" of shooting someone.
Deal with it pragmatically or don’t carry.
Once a person becomes an aggressor with the will and capability of causing deadly or severe bodily harm to another they have offered up their life to chance through their actions.