One would imagine that given the frequency of these phones and accounts being hacked, that people would act to ensure this doesn't happen. Evidently it's not, as seen with this hacking.
Who is to blame for this? We can't really blame the victims, that's a bit like closing the barn door after the horse has bolted. However, we can blame the hackers and the distributors, they're the ones who hacked these phones and they're the ones making money from this. Now, like I said, blaming the victims is pointless, but you can't help but feel that a modicum of common sense could have prevented this. Even someone could have just said to themselves "Yeah, I'd like X to see this picture, but would I want it being plastered over the internet?" Which kind of leads into my next point.
On the one hand, all they can do right now is damage control. On the other, however, to use that tired cliché, there's no such thing as bad publicity, especially in the digital age. People are going to use search engines, they're going to talk about the various celebrities, this is raising interest for any given victim of the phone hacking. The smarter ones are going to give interviews about how livid they are, they're going to go on talk shows to discuss how they felt. A lot of them are going to come out of this smelling like roses.
I do want to say however, that I find the whole thing distasteful and a huge invasion of privacy.