When people have a lethal option, you have to rely on perfect training and stone cold emotion control with rational thought to guarantee its not used. If the cop has had a bad day, is particularly tense, tired, glasses foggy, pissed, racist or believes stereotypes, just watched a movie where a cop was killed... Etc etc, then who can guarantee that they will always make correct decisions. And if they make the wrong decision, everyone gets fucked but the cop
It's fucked all around, but I don't know the solution. They are people. And while we assume or hope they should have perfect training and every cop should be perfect... One bad day can make something like this happen. No matter the training. People are too damn fucking complicated
Edit: So I guess what I am saying is it's time to activate skynet and let robots decide who lives and dies