Teenagers are run ragged so that they will not question the way things are.
Clarisse tells Montag that she is afraid of kids her own age, because they are so violent. They literally kill each other, either with guns or car wrecks. No one stops to talk to anyone. In school, information is shot at them. By keeping them from thinking for themselves or talking to each other, the teenagers are easily controlled.
They run us so ragged by the end of the day we can't do anything but go to bed or head for a Fun Park to bully people around, break windowpanes in the Window Smasher place or wreck cars in the Car Wrecker place with the big steel ball. (part 1)
The most important thing for their society is that people do not question. They want to keep everyone happy all of the time. This is why they do not allow books, and focus so much on television. There is no real interaction. Violence and destruction is fun.