It's hard to debate this cop excessive force shit because we're usually dealing with borderline illiterate eyewitnesses telling obvious lies and local bureaucracies trying to bury shit regardless of the merits so it doesn't come up in the next election cycle.
There's two conflicting ideas here, police worship by people who think they're heroes because they do a dangerous job, and people with a reflexive suspicion of all things government. The first one stems from inexperience with cops, a personal connection with them, or left-leaning government=oversight mentality. The second stems from multiple impersonal interactions with police or a hard line take on libertarian philosophy.
The way I look at this shit is 9/10 times it's two idiots who deserve each other engaging in some mutual annihilation. The remaining 10 percent is either people committing suicide via violent crime, or cops just flipping shit and abusing their power. I think these are the minority of cases, and more often than not it's some thug cop shooting some thug or vice versa because the street wasn't big enough for two thugs. It's "1v1 100k bro" in the real world.