You really don't get it, do you? The point is that the police acted on a false malicious accusation and, although the police eventually released him without charge, the club chose to ban him for six months. That is injustice pure and simple, and has absolutely nothing to do with how other fans behave.
At the risk of invoking Godwin's Law, I would point out that one of the things that allow dictatorships to imprison people at random is the belief that "innocent folk have nothing to fear". Quite clearly they do....