So now we're to the "well, things are just bad, no way to fix them, so just snap to when a cop abuses his power; since we can't fix it? It's just basically the world!" part of the discussion.
Guess what? We can fix it. We can fix a lot of things, like the lack of opportunity in low-income communities, like the price and quality of medical care, like mass shootings, like ballooning student loans, and yes, the problem of bad cops. ALL OF THIS can be fixed. It just requires more than quick, easy, soundbite-friendly solutions, so we throw up our hands.