Now its interesting that you bring it up, because im strongly in favor of private institutions saying what people need to do to enter their businesses, like bars, movie theaters, stores, etc. If its private property the owner gets final say, however for public property this becomes more difficult. All federally owned parks, last I checked are actually owned by the people, so it is a personal choice (up to the individual) in these areas. Public schools' choice should be left for the community to decide, as most of the funding typically comes from the community (also education is a right) and since its more than one family sharing the space, a simple vote should suffice. Libraries should follow the same argument, let the community decide. Again my argument is that you shouldn't wear a mask, its that the decision should not come from the government.