Could you maybe stop telling people what they should and shouldn't do? It's really annoying. You're not the boss of others and your need to lecture and place yourself above others in morality terms is not going to win you any favours round here.
Just so you understand, it's possible to care for missing children while also maintaining an interest in new info/views pertaining to those same missing children. The two things are not mutually exclusive. Clarke's book, quite rightly, got an airing on here. Some felt it contained interesting info, others didn't. GA's book will also, quite rightly, get an airing on here and will very likely generate the same mix of reactions - the pertinent point being, how can anyone know if new light is being thrown on this case if no one knows what's being said in these books?
And GA, let's not forget, is coming from a place of hands-on, first-hand knowledge. He, at least, has that in his favour.
If people want to buy it/read it, in order to see what he has to say and perhaps share on here for discussion, then allow them to do so without your constant need to finger-wag.