[beowulfey]

Public libraries allow anyone in -- BPL for example. I used to study there all the time, but I didn't think it was that disruptive. This is just one opinion but I actually really like this as a heuristic and will probably use it myself. Libraries should be open to all!

[whimsicalism]

Not as many people are trying to enter BPL as, say, Widener Library.

Widener also has some areas that have to maintain absolute quiet. I have found this generally doesn't work if tourists are allowed in.