Is there an assumption, in this thread, that you will only shoot once?
What if you shoot more than once, or twice or three times or...........
If the goal is to keep shooting until the threat is neutralized, wouldn't you?
There is an assumption in your post, that you will be able to shoot more than once.
What if you get shot, or your weapon malfunctions, or............
If there is a possibility that you will only get one shot to neutralize your target, why make it a less powerful one?