Okay, so... the police are looking for a fellow who beat up his girlfriend. This isn't a criminal mastermind capable of blowing up a whole city or anything extreme like that. I don't see where knocking on someone's door in the middle of the night and demanding entrance is necessary. This is America. The fellow who answered the door is an American. Go get a warrant.
I have a feeling if the camera weren't running that this story might have had a very different outcome. Notice the cops always tend to say "turn off the camera?" God forbid there be video evidence of them bullying a private citizen.
You know, I highly doubt this Michael Brown fellow is anything like a martyr, but one thing is certain: police are supposed to "protect and serve." Not bully. In this case, however, the white cop was far more polite than his partner.
I find it incredible. Imagine waking up in the middle of the night to this.