Why does Beatty refer to the old woman's books as the Tower of Babel?

Beatty refers to the old woman's books as the Tower of Babel to emphasize how books can cause division and confusion in society. In the story of the Tower of Babel, different languages caused people to misunderstand each other, leading to chaos. Beatty sees books as dangerous because they can lead to different interpretations and ideas that challenge the status quo, potentially causing disruption and unrest.