Then you really should have left this discussion alone then. You are asking questions about why fans aren’t forcibly removing banners from other fans who are a few hundred in size and passionate about their right to protest. (This isn’t me saying they have such a right but they believe they do which is the important factor) How do you think that plays out in the real world?
I’ll tell you, it plays out with fans rioting, mass brawls and lots of people including children getting needlessly hurt or worse. That’s what you are advocating for, it’s stupid, reckless and dangerous.
Leave the policing to the police and leave the fantasy for the movies.