When Montag goes to Faber's house, Faber tells him that books alone will not save their society. He says that books are only a "Praetorian guard" that can warn people not to jump off such high cliffs.
But society needs books, but also the leisure to read them and think about them. And people also need the right to act on the thoughts they get from the books.
I would agree with Faber here. Of course just having books will not save their society. The people will need to read them and think about them in order to understand their meanings. And the people will need to act on what they get from the books.