This is a very interesting debate once you get past the sickening initial couple of pages of the article.
Firstly, in terms of the debate about whether booksellers should stock works by convicted criminals. The general maxim is that a person should not profit from his crime, so if someone was to write a book about the crime they committed they should receive no money from doing so. This is not the case in this situation. His work and his crime are not linked so you wouldn't ban it on those grounds. Equally, it's hard to see (as some people have suggested) that his work should be banned as people wouldn't want to own book by a person like that - that even if the books are entirely innocent and in no way linked to his crimes, his work is somehow tainted. It's not. If he hadn't been found out and convicted, we'd never have known and the books would have sat there peacefully on our shelves just like any other. His crime does not taint his work.
The only justification was not stocking his book is that his crime is that people do not want to feel that they or others are inadvertently enriching a criminal. That their hard earned ten quid is going into his pocket. That's also a little bizarre. Given the number of people who've been through the prison system we almost certainly enrich people who have been convicted of crimes on a daily basis, either directly or indirectly. Even if we chose to lock him up for eternity, it would still be costing each one of us money to keep him under lock and key. I suspect what's driving this is that his crime is so appalling and his sentence so lenient that it needs to be punished more, and in any way possible. Strangely, despite everything I've just said I actually agree although I'd say this is an entirely emotional response rather than a logical one.
Secondly, of course these sort of details should be published (provided the victims aren't identifiable). This is the real world and it's a desperately vicious and unpleasant one in which children are raped, tortured and murdered on a daily basis around the world. Just today the broadsheets carried the news that Samir Quantar had been released from Israeli custody after having been convicted of the brutal murder of a 4 year old Israeli girl and the effective murder of her 2 year old sister - I won't post the details as clearly people get distressed, but it's in The Guardian and The Times for starters. Wilfully ignoring these things won't make them go away and in fact let's them carry on. It's only by people being sickened, appalled and angered that they're likely to change. That being said, giving people a heads up that what they're about to read is distressing would allow them to prepare themselves more appropriately.