Why does everything go downhill for society according to Bradbury?

Fahrenheit 451 by Ray Bradbury is a great, and classic, dystopian novel. Why does everything go downhill for society according to Bradbury? Is it because of the politics, the citizens, or the art they choose to destroy (and what they let survive)? Or are all 3 tied together? The paper should consist of 1 page (or less) summary of what you read, 1-2 pages answering the questions above, and 1-2 pages reaction to the philosophical themes of the book.