I already tried to explain it to you. Pay attention this time. Those fans are all extremely low risk individuals, and furthermore they are outside. Their risk of transmission is extremely low, and a mask will not alter that. Let them enjoy their game in peace. You would do far better to worry about the woman in the grocery store next to you who, though she wears a mask, touches it often without washing her hands.
You seem blithely unaware that these lockdowns do not come free of charge, but have a very real cost: mental, emotional, and even physical. Suicide, depression and other mental health issues, homicide and violent crime, divorce, spousal abuse -- these are all sharply up. Tens of millions of children have lost a year of school and many of them will never recover from the developmental issues resulting from a year of social isolation. And all the above ignores the economic cost: hundreds of thousands of people who have lost their livelihoods, their small businesses, and their life savings. The cost is far too high, especially given the essential ineffectiveness of these lockdowns. Mankind has never been able to eradicate a highly infectious respiratory disease in the past, and Covid will be no different -- as more and more nations in Europe are finding out, as they go back into a second wave of lockdowns.
Wrong again. "The flu" is actually an amalgam of many thousands of different influenza strains, constantly mutating, which explains why you need a new vaccine every year, and even then the shot is sometimes less than 30% effective. Covid presently at least is mutating rather slowly, and unless that changes, the Covid threat will essentially vanish within a year, whereas the flu will keep on killing for the rest of our lifetimes.