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There are several important and related Themes that are developed throughout the novel. By describing the damage caused by a lack of books or knowledge and by an over dependence on technology, Bradbury's purpose seems to be an attack on such conditions before they occur, hopefully to prevent them.
The major theme of the book is Bradbury's attack on censorship. In the futuristic society he portrays, the government has banned the reading or owning of all books and the accumulation of any knowledge. As a result, the citizens have become non-threatening, non-interesting humans who can be easily led and manipulated through fear. Even though the society that Bradbury depicts in the book is very extreme, there is a clear statement about the danger of any kind of intellectual censorship.
Closely related to the theme of banning books is the theme of conformity. The government has disallowed the accumulation of any knowledge, from books or other sources, for it does not want any one person to be smarter than the other. If everyone is exactly alike, stripped of knowledge and interest, they will pose no threat to the dictatorial government in charge.
Bradbury also weaves in the theme of the corruption caused by excessive reliance on machines rather than humans. Since everything in this 24th century society is done through automation, humans have lost the ability to do even the simplest of tasks. Apathy and ignorance are the norm amongst the citizens and they pass their time watching boring television, programmed by the government, and taking pills to make them sleep and temporarily forget the miserable state of their existence. Some of the machines are described, and they are frightening. There is the Mechanical Hound that relentlessly pursuits and mauls a criminal who dares to have a book in his house. There is also the Big Flue into which all bodies are placed after death.
The tone of Fahrenheit 451 is eerily futuristic and gloomy. The world, as it is portrayed in the novel, is a dictatorial police state, filled with strange technological modernizations that have deprived mankind of a purpose. Accumulation of knowledge and the possession of books are illegal. Mechanical Hounds are programmed to hunt down and kill "criminals", whose bodies are then quickly destroyed in helicopter crematoriums. Although Clarisse brings some brightness to the novel for the short time she is around, her death is yet another gloomy and frightening reminder of the cold and unpredictable world created by Bradbury. At the end of the novel, war has ravaged the city in which Montag lived. The only other bright spot occurs when he and the other exiles walk toward the destruction with the hope of rebuilding it with freedoms.