conspiracy theories

I don´t know much about conspiracy theories, but I searched in the web and I going to try to explain one of these theories. 

These theory have to principal actor a book and his name is "Catcher in the Rye", a lot of people affirm that this book serves to program assassins or it's a book with a curse

This idea was born because the killer of John Lenon delivered the book as a statement. And three hours later of he detetention he said "I'm sure most of me is Holden Caulfield. The rest must be the devil"

But this is not the only crime that had relation with this book. In 1981 John Hincckey tryed to murder the President Roland Reagand and he said that he was obsessed with this book. In 1989 Robert John Bardo shot the actress Rebecca Schaeffer and he was carrying a copy of this novel, the same one that she threw on the roof of a building while fleeing from the police.

But what is the special of this book? If this book has a trauma about black humor that get inside the mind of a teenager with his problem and vision of reality 

What is the reason for this book?

The explanation of this assumption and the influence of this book can be read on the minds of certain people, according to the studies of the conspiracy theories, the relationship with the MK Ultra (Mind Kontrol Ultra) program, which the CIA implemented from the 60s to perform certain activities and mental control systems

But we can not have the surety that this theory is true. For now this is still a mystery.