BookLover: The main theme in Fahrenheit 451 is the effect of censorship, and how both ignorance and knowledge are important factors in propaganda and other potential forms of bias or censorship. For example, books are banned in the future, yet the reader does not receive an answer or explanation as to why that is. Instead, people are focused on other forms of entertainment that are perhaps less intellectually stimulating. Hope this helps!
Theme in Fahrenheit 451