Intelligence equals power in our society.
A horrible horrible thing. Envy is, too, a horrible thing. Ignorant people read things with the approach of being intelligent, and thus wish to read more in the story than what is apparent, which is all a story should be reda for. Stupid people have read this book and, in searching for some deeper meaning, some key to life and all of it's joys, so they found that the nearly irrelevant topic that Holden feels he is a madman relates to serial killers so they have thus been associated. If you look at a star for a long time, it appears to move.