The main character, Montag, is fireman. But in that era, firemen don't put out fires. Instead they burn books. It is by this that we are meant to feel revulsion at the life that Montag leads. We are also made to feel that the future society is clearly dystopian.
From watching the movie of Fahrenheit 451, we notice many things that make us feel that this world that Montag is living in is clearly dystopian. For one, there is the rule where no one is aloud to read or have any books whatsoever. This is a dystopian aspect because by this, people will depend too much on technology, making them lazy, dumber and even isolated. I say isolated because when people are so into their technological equipment, may that be phoning someone on your cell phone, or playing some video game or any other means of communication and amusement, we barely have the time to interact and socialize with other people, witch then makes us isolated from the world and other people.
Another thing that gives us a dystopian aspect is how so many people live in secrecy just to keep a simple book. In the end there is group of people, known as the "book people" who live somewhere isolated from society and actually memorize a book they assigned themselves. This also shows dystopia because here we see how people are so attached to books and the knowledge they contain that they memorize the entire book just so no one can take this information away from them.
One of the last things that shows us dystopia is the part where Montag read a section of a book to his wife friends and then after Montag is done reading, the friends say how awful books are and how they make us all depressed. This is dystopia because the people there have a wrong understanding of the meaning of books - for some books, we are meant for us to be touched, whether is be sad or happy, and for others, it's simply just stating the truth that we should all be aware of.
Having said all of this, we can see how we could avoid living a world like the one Montag leads. This is, I think, the purpose of dystopian books. By reading these kinds of books, we can have a few ideas on how to prevent dystopia.
