It's a fair point, however, if you get 100+ going on all at the same time!? Not sure prosecuting one or two, out of 100+, would hold up in a court of law unless those arrests were for violent behaviour.
You see demos in the UK, often violent, and how may arrests are made when conceivably 100's could, and arguably, should be arrested!?
At times, IMO, the law is an ass.
In any event, think there is scope for demonstrations in the stands and outside the ground which if done en masse could be equally effective without putting individuals at risk.
Whether this is ever proved is another issue. An insolvency might result in a deep probe.
I don't think I'm alone in understanding the sentiments though!