Oh my god people like that need to be sterilized.
first off- clearly there was more to that then what you saw on film. They were likely asked several times to stop what they were doing, and refused. I don't know the laws in that specific place, but if an officer asks you to stop what you're doing, then fucking stop it.
Those other guys got exactly what they had coming too. Mocking the cops in front of them, trying to cause a scene and give them problems.
What was the problem with NOT dancing there.