It doesn't say what books. Shouldn't matter to some extent, but odds are it's a deliberate provocation as opposed to a book that the library is "organically" including in it's collection. "If your enemy has a choleric temper, antagonize him" works very well. But don't pretend it's not a tactic. I don't think this is the same as the "sensitivity readers" censoring Dr. Seuss or Ian Fleming or Agatha Christie or stuff that's been on long standing publication. Provoke, and then talk up your opponents bad reaction.