The cop in this situation escalated the situation when he moved closer to a man who was already upset. If he hadn't stepped forward facing the issue it would have been easier to diffuse the situation. He could have simply told the guy to sit down while he checked on the story the other guys had. Then armed with both sides of the story he could have given some options to whomever was more wrong. He could have cited the ones who hit the other guy (or used it as a threat) and told the guy with the split lip that he had no choice but to get his gear and clear out. It wouldn't have put the cop in the position of a "jack booted thug" and the whole situation might have been resolved.
When in a confrontation the last thing a cop should do is escalate the situation. The get classes on that sort of thing. (or used to)
When in a confrontation the last thing a cop should do is escalate the situation. The get classes on that sort of thing. (or used to)