Banned book month

Celebrating the Freedom to Read is observed during the last week of september through out the world.

You will be surprised to notice that some of your favourite books which are now classic and are essential to a proper library were banned once

And here is their list of the 100 Most Frequently Challenged Books of 1990–2000:
https://www.ala.org/Template.cfm?Section=bbwlinks&Templat e=/ContentManagement/ContentDisplay.cfm&ContentID=85714

One of my favourite 'controversial', 'challenged', and downright 'banned' book is To kill a mocking Bird😆..It's amazing that, even in this day and age, perfectly harmless books like Harry Potter have been challenged and attempted to be suppressed

Neway my question is what are your thoughts on banned books? What kind of books really should be banned? Should any be banned?