The police are totally out of control in this country. They are out of control because they are untouchable. That was the lasting legacy of the Rodney King acquittals: you can do what you want if you're a cop. You can beat a black man senseless for nothing. You can beat a homeless man to death with your fists. You can pepper spray, tackle, and beat peaceful protesters dancing in a public square. You can smash people's cameras who are trying to document your abuses. You can send SWAT teams to the home of the mayor of a small town, shoot the family dog dead, track the blood all over the house, put the family on their knees for hours with guns to their heads, and then when it turns out it was a mistake, leave, laughing and saying "you're lucky we didn't arrest you."
Almost certainly it will get much worse before it gets better. Armed with ever better surveillance, city police are going to get much more powerful. And power corrupts. I think we'll be hearing about a lot more of these kinds of abuses.
Eventually, 400M Americans are going wake up, realize that they've had enough, and effect real, lasting change.