Does controversial books can be kept in the library?

It’s a common questions for all working professional, some of the controversial books have been banned by the respective governments for hurting individual’s sentiments of the citizens. However some of the faculties are required these books for their classroom teaching. The problems for a librarians are;

1. Where do we get these books? Because already books have been banned?
2. If we get these books, Can we kept in the libraries? If yes it might be hurt of someone’s sentiments.
3. If we make it available in the library it may mislead the student’s opinions as government has already banned these books.

A survey was conducted on 9^th November 2016 in USA on “Controversial books in the library”, a following link may helpful for understanding more on this issue.

https://natlib.govt.nz/blog/posts/controversial-books-in-the-library