I don't know of any police agency in the US that teaches an officer to shoot to kill.
It has always been, shoot to stop the threat.
Many officers shoot very poorly on the range. Some would have trouble hitting a phone
booth if they were on the inside with the door closed. Yes, they are that bad, well, almost.
On the range we used the black silhouette inside of a white background, but that was
racist. Now it's the white silhouette inside of a black background, but that's not racist.
Outside range qualifications are usually done on very nice days. The target doesn't move
or shoot back. Most silhouettes don't have arms and legs.
Everyone has ample time to complete a course of fire. Yet, some people repeatedly fail
and have to retest, sometimes several retests.
They can't hit center mass much less a smaller target/area that is moving.
With all those target misses, those bullets will end up someplace else and the officer will
have to fire his gun more often to hit his target.
The end result is bullets ricocheting off the pavement, walls or simply killing the bystanders.