I don't think it's that unreasonable to think Sony will be sued over this, and I hope they'll get very closely inspected. This is a huge number of accounts (again, it doesn't matter that some of them might be fake or whatever, on paper, they're all "real" accounts) compromised, iTunes, Steam and countless other services seem to be able to defend themselves against such attacks (and I have no doubt these services are targets), but Sony weren't. Because of this, I'll have to assume Sony did not guard their users' data close enough until a judge specifically rules Sony did everything reasonable in their power to protect the data - Sony could and should be held responsible if they didn't take the right measures to protect your information. This is not an everyday occurrence, most big companies are able to protect their users from this kind of leak, but Sony wasn't able to, and until I'm told otherwise, I have no reason to give them the benefit of the doubt.