I love your inclusion of "violently". Is there a "non violent" way to kill another human? Yawn.
You're presenting the ultimate No Shit argument here- cops kill more people than people kill cops. I guess this saddens you or something, but the entire profession revolves around training to not be killed. This is because cops are faced with gunfire or violent situations on patrol routinely. Your numbers also don't say anything about many how many times cops are shot at, attacked, or shot non-fatally by assailants.
Sure there are many cases of lethal force used that warrant review, if not prosecution. But in the grand scheme of things those numbers are small. Cops end up killing people, most of the time, because assholes are doing things that warrant being shot.
And then the public can spin things like saying a drugged up maniac, attempting to ram cops with his car, was "unarmed" yet shot anyways. And get up in arms about it.