I'm sorry but really? I'm not saying thing are great. They are not. In fact situations like this one in Mo. suck. But... the police riot
http://en.wikipedia.org/wiki/Police_riot is nothing new, and I'd say that things are better now than they've ever been. Why? Well at least in part because just about every citizen is armed... not with a gun but with a camera. Cases of egregious misbehavior can be documented and investigated. This crap makes headlines and eventually the sunlight will clean things up. Not entirely, there will always be those who abuse their power, but things really are better than they were in my youth. There have always been good decent law officers and there've always been bullies with badges. Same as it ever was.
Don't get me wrong. I'm glad you're outraged, but understand it's an old, old problem.
Now I do agree that the fire power the cops seem all to eager to deploy is really over the top.