Are you more disappointed with Sony? Or the hackers who started the entire mess to begin with?
Easy. It would be Sony bro ... pure cowardice on their part. Today is a sad day for freedom of speech. They were probably worried about liability issues in case something happened, or may be the hackers were not bluffing and had some more dirt on Sony.
At the same time though, if a movie was made about assassinating a US president while using his real name while he is office, you gotta expect a backlash. Let's get real