At a basic level this is exactly why crowd control matters in high tension matches, because once the atmosphere tips from hostile to dangerous the game itself becomes secondary and everyone loses. You can understand rivalry, you can even understand a bit of noise and needle, but the moment a player is being attacked and people are getting onto the pitch it is beyond anything defensible and the punishment has to be severe. Honestly though it is always the same story with these idiot fans ruining a massive occasion and then acting like victims when the consequences land, absolute maddening rubbish and I am sick of seeing clubs embarrassed by people who clearly do not care about the club at all