Is that so? What counts as "unambiguously justified" to your eyes? I don't see how this squares. I mean... let's pick "the dead subject initiated lethal violence first" as a reasonable proxy for what you're talking about.
You're saying that in situations where someone attacks a police officer, the police are 1000/50 == twenty times more likely to win that deadly confrontation than lose? Really? They're well trained, they aren't that good shots.
I think the jury is very much out on that assertion. In this era of pervasive video, we're finally getting a look at a decent fraction of these confrontations, and a shocking number are not justified at all, much less "unambiguously". I don't see how you can reasonably assert that all the unmeasured ones must be...