But won't that just drive all those behaviors outside the pitch (the streets, social media etc.) ? Redirecting a problem is not solving the problem at all.
You can round on them of course, but it requires getting physical and having the strength and numbers to batter them, before they batter you. That's the harsh reality. And it's a long process that has it costs, for example people getting nicked and other ugly stuff that will be exhausting for a low earning man's pocket. It's not a choice in 2021.
Middle ground solutions are more possible, but as long as they are forced by federations people will just rebel against them. It's like communism in most balkan countries. The soviet union was let's say more than forceful there, and after its reign ended, in our day most of those countries are strongly anti-communist and strongly nationalistic far right. The counter-action to every measure must be weighted because its effects sometimes are a lot more counter-productive.