I'm wondering, should any book that describes how to commit an illegal action be illegal, or just one that describes how to commit sexual assault on children? It's easy to ban something when it is something the vast majority of people agree with, but this is the case where the ever so popular slippery slope comes into play.
1. How about banning books that describe how to make bombs? I remember the first thing I ever downloaded off the internet (or actually an online BBS way back in the day with my awesome 2400 baud modem) was a text copy of the Anarchist's Cookbook. Totally out of curiosity value. Never actually tried to make any bombs.
2. Or how about books on teaching someone how to grow marijuana? I actually possess a few of those myself, and did use them to commit what was at the time a Class 4 Felony in the great state of Colorado.
3. How about stories that involve the sexual assault of children? That's the other crap I saw on internet BBS until I learned how to avoid them. I remember reading a case of a Pennsylvania woman who was charged with obscenity for writing stories like that and charging a whipping 30 people 10 bucks a month to access the site that had them. She was an agoraphobe and eventually plea bargined a guilty plea so she didn't have to spend any jail time and was just under house arrest, which doesn't seem like much of a punishment for an agoraphobe. I thought it was a violation of the first amendment myself, as it was just sick text from the mind of a sick woman. Stories about people who murder are just as ethically bad to me but are sold everywhere.
4. How about a book on how to cheat on your taxes? I'm sure the IRS wouldn't like that.
I believe that while I'm sure 99% or whatever of people can agree to ban a certain sort of text, it will definitely lead to other sorts of speech being banned where maybe 99% don't agree with it. That being said, Amazon or any other company is under no obligation to sell it, and people are more than welcome to boycott a place that would sell it.