Why bother with security?
From where I stand, giving information to a bank seems to have become the equivalent of publishing it on Facebook in private mode: you only THINK it's safe.
The article makes an interesting observation, though: from the type of data, it can be inferred where the leak occurred, which may identify the guilty party. I'd be worried about that if I were the leaker, because law enforcement there makes Abu Ghraib look like a holiday camp.