Of course there's not going to be any "good" coming from this, of course it's not going to raise deaf awareness, that is absolutely not the intention of the book. I've already mentioned that this book isn't intended for educational purposes, it's entertainment.
But I notice you say no good could come of this, and yes that is surely the purpose of every book ever written no? But you haven't given a reasonable explanation of the lasting ramification against the Deaf Community that could ensue that warrants stopping the publication of this book.
Sign the petition if you want, but it's not going to do actually stop it. A bunch of people telling the publisher....Hey we don't this idea, is not going to stop them. But if people are going around posting the petition all over the internet a vast vast more people are going to be aware it even exists. Trust me, buying a book to learn profanity in sign is not going to cross very many peoples minds, they're not going to go looking for one, but if people are telling them about it, how many people who the idea never would have even crossed their minds, are now going to go "oh cool" and buy one? you guys are shooting yourselves in the foot here. Best thing to do would have been to ignore it all.