If not, then I can see why this might be Apples fault for allowing developers to abuse this.
If yes, then how can this possibly be Apple's fault? It seems almost absurd to blame them. The buck stops with the end user for not protecting their Address Book. If you allow some weather app to download your Address Book, why should Apple care? You cannot trust every developer (turns out we are all data hungry), and they even asked to peak in there too.. You explicitly gave them permission!