First of all, a sheriff deciding a book is so horrid he should have agents solicit a copy from out of state just to charge the author with violating a law that doesn't exist where he lives reeks of entrapment to me. Of course, a lot of undercover stings against pedophiles reek of entrapment to me; I think it's pretty sad that someone can be online typing away in a chatroom when someone pretending to be a 16 year old repeatedly throws themselves at them just to make a bust and "protect the children". Bekah mentioned bombs above; I can't imagine any other crime where cops can arrest someone for agreeing to commit a crime they solicited the person to commit. Ask someone to kill a child and it's a felony; ask them to have sex with one and it's a public service. The sheriff in this case appears to be part and parcel of that mentality:

If I had a nickel for every person who's done something I think should put them in jail I'd be a millionaire, but if I went out and solicited them to do things that are legal where they live and illegal where I live just so I could bust them I'd simply be unsuitable for law enforcement. Crusades aren't in that job description: Justice is, though that's too often neglected when it's eve acknowledged. But it's all OK as long as they can wrangle jurisdiction, even via entrapment, because "there's nothing in the world more important than our children". The most draconian measures are justified the moment children are involved. Just, y'know, don't tell Chinese toymakers that.