Curious that it does not count books that librarians or educators choose to restrict as "banned". In my local library system, it's almost impossible to find cop

Curious that it does not count books that librarians or educators choose to restrict as "banned". In my local library system, it's almost impossible to find copies of books with a heterodox perspective on controversial issues, for example Abigail Shrier's book Irreversible Damage. Of course that isn't "banned", it was just an internal decision not to purchase it...