One of Beatty s criticisms of the old woman and her books is that none of those books agree with each other. Obviously, author Ray Bradbury wants us to read a wide variety of books. What, do you suppose, happens when we read only books that align with our own world view?

We limit ourselves

Explanation:

With books it´s the same as with people: the more diverse the books you read or the people you meet, the more your mind opens up to different views of how the world is or could/should be. Totalitarian regimes - as the one presented to us in Fahrenheit 451 - can be succesful exactly in situations where everybody follows blindly one personal view (that of the leader) or, as in religious fundamentalism, one book.

the main idea of monster inc is good and evil

if im wrong correct me but have a blessed day!