That's exactly who pays them.
Oakland was blatant excessive force, but par for the course there. A kid get's executed by some idiot on train platform who "thought it was a taser", and anyone thought something like this could go down with out them getting to exercise their aims with live targets?
We've seen a lot of protests and movements lately, and we've seen many of them bring about huge changes. Sadly these are not our movements, but rather the movements of those far across the pond, who are exhibiting significantly larger balls than are on display at any "occupied" site. And when it gets cold enough, we'll all go home and have some hot chocolate, turn on the TV, and surf 49,354 high definition channels without moving our fat asses off the couch. It's the American way.