I'm glad that Bradbury novels often include a dichotomy between the characters of lightness and darkness, tyranny and freedom etc, in the form of a brief vocal argument between the opposing philosophies. In Fahrenheit 451, it was the chief fireman vs. Guy Montag. In this film (I haven't read the book yet), there is Mr. Dark vs. the librarian, where Mr. Dark articulates his perspective on darkness.
Unjustly maligned adaptation of Bradbury's classic may not completely capture the dark magic of the book, but still does a very good job of translating it to the screen. Some of the minor characters and subplots are underdeveloped, and the young actors playing the boys aren't the best, but they're backed up by a great cast of character actors and some impressive special effects. Definitely worth another look.