Those trouble makers were robbery. This video show clearly who wants to break tho store window and what they want to take. The crowd just being "used" by them.
I don't know whether those few guys who tried to stop the action were staff or not. If they were just the few clear-minded person in the crowd and spent their efforts to stop the criminals, I feel proud of them.
My boss went to the game last night. He said that there were some drunks/fans caught in the mayhem. But the real trouble-maker came prepared with things for throwing in their backpack and used fire-extinguisher as weapon and smashing windows. How many real fans carry fire extinguisher in their backpacks? I agree win or lose, there are people in the crowd determined to create trouble.