J.D Salinger is a genius for more than one reason I am sure, but for me there is but one - The Catcher in The Rye.
The book is a masterpiece. It has influnenced just about every artistic medium, and reading it for the first time recently, I was captavaited by how, well, captivated I was for a book written in the 1950s.
If you haven't read it, you should.
And even though a fair share of assassins have made it their book of choice- don't worry about it - it probably has something to do with the fact that they're outkasts and relate to Holden (the main character), and probably already had something seriously wrong with them prior to their reading. Or maybe Mel Gibson is right and its a government conspiracy. Either way, the chances are pretty slim - so you should just go ahead and read it.