If you cannot see the differences between a private nude picture and a private political statement, we are in two different universes and cannot ever communicate.
I disagree with Gremlin's point but the analogy is sound. Romney made those statements in a private setting and then was humiliated and had his actual career hurt by their public revelation. The leak was "good" for his political opponents and people who were unsure about his true feelings for lower class Americans, and it was "bad" for Romney, moderate Republicans who wanted him in office, and the people who actually agreed with the sentiment.
The photo leaks are obviously bad for the women (and one guy) targeted, Apple, and 'selfie culture' in general. It's arguably good for the millions of people who enjoy looking at nude pictures of famous women on the internet.
Obviously the blanket statement "all leaks of private information are morally wrong" doesn't cover the nuance between the two, so it's best not to argue with such broad strokes. I think it's more productive to say that leaks of information that contribute and improve public discourse are often quite valuable. Leaks of more frivolous information, like people's messed up romantic texts, nudes, or embarrassing home videos, serve no higher purpose than entertainment, and most people are raised to believe that entertainment at other people's expense is wrong. You
shouldn't share stolen photos for the same reason you shouldn't pants the guy in front of you at Dunk N Donuts in the morning; your personal amusement is causing someone else humiliation. Now, I also believe that
passively viewing said material is another area of distinction. You are not contributing to the dissemination, it's already there. To reuse the same analogy, your moral culpability for watching a guy get pants'd at D&D (and perhaps even having a hearty chuckle) is different from being the actual perpetrator.