If you find Amazon's response "quite unnacceptable" that's your affair, and you are perfectly at liberty to withdraw your custom. It's not for the BBC or you to decide what is, or isn't "right thinking". If you search the Amazon UK book site for the word 'paedophile' you'll be returned 958 references - many of which might offend at least one person, but none of which are banned.
The book in question has not been banned, and book retailers will make their own decisions as to whether or not they stock it. Customers who don't like the look of it can choose not to buy it.
We're a computer help forum, and Speakers Corner is for topics loosely related to computing. Neither this book, nor your attitude to it are in any way computer-related, so I think we'll leave it there.