Do whatever you can to stop this type of behavior from being encouraged. I will remove the link in 24 hours if the listing is still there so I don't do anything to give that creep advertising.
UPDATE: Amazon took down the listing, which I verified this morning. So thank you, Amazon! Hopefully, all the complaints and protesting will help Amazon be more diligent in their filtering of what gets through. I am all for free speech, but any book that incites people to do harm to others (especially children) should not be sold by family retailers. I'll stand by that statement for any book that encourages crime or violence against any group.
Anyway, the short of it: The book is gone, and I will continue to have Amazon ads on my site as long as they continue to protect the safety of their customers. Thanks for your help, everyone!