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You realize that judging acts is not within their domain and sphere of interest, right?Wat? Judging acts is in the "domain and sphere of interest" of any person.
Please note (if you can avoid shooting from the hip) that I'm making this point to criticize police overreach - even a perfectly "clean slate" cop with no peer pressure will develop a bias towards thinking of everybody as a criminal! Similarly, a cop that lives in a White community and works in a Black neighborhood is going to find it awfully hard to not develop a bias of thinking Black people are more likely to be dangerous. (and, in case it's not clear, vice-versa)
If you cannot bear to entertain thoughts like the above, then you really aren't interested in analyzing the problem. Because all of the "training" in the world isn't going to counteract a bias that is reinforced every single day!
What is needed are actual real incentives to not murder people, but fortunately this is a pretty old problem. Apart from responding to a rare overt attack (eg aiming a gun or charging the cop), any cop that shoots someone is themselves committing a crime (somewhere between voluntary manslaughter and second degree murder) - undermining that very "law and order" that police purport to uphold! The routine and casual corruption that allows these crimes to go unpunished needs to be rooted out.