No there doesn't have "to be some history between that man and these cops".This will be unpopular but having watched and listened to the video it is clear the cops went way to far and the lack of medical attention was ridiculous.
That being said the victim always said he was complying and never did. Every time they made a request he said okay and then didn't comply, "lay on the ground" he said okay and then wouldn't do it. He was being extremely uncooperative all while claiming his compliance.
What I see out of those cops is frustration and it exploded on this man. I would bet these cops were familiar with this person. They worked that area of town every day. He was blocks from his house.
They didn't pull a random person over for no reason and decide to beat them to death. There has to be some history between that man and these cops.
Some cops are just horrible people that have no business being in law enforcement and are nothing but criminals themselves.
That's not an indictment of law enforcement as a whole by any means. I was in a LE agency for nearly twenty years and I'm married to a police officer.