This really makes me angry. I personally can't comprehend how anyone could do something to harm someone else (physically or mentally - this comes under mentally - ruining peoples enjoyment) with no motive or reason.
Before someone mentions the (completely non-justifiable) reasons that some people are stating, these reasons still give no excuse to attacking the customers, by stealing personal info, or taking away the ability to enjoy playing games online.
Its like people who spoil endings to games/ films/ TV by posting the spoiler as a thread title. There is no reason to do so apart from their own enjoyment, which makes them horrible people, which the world would be better off without.
And to the people who can't understand why everyone is so angry at the hackers, you've got to remember they aren't just affecting one person. They are attacking millions and millions of people, which surely boosts the severity of their crime by quite a bit.
And again, to the (very few) people who agree with their cause and are defending them, did you read their twitter feed? These aren't noble hackers attacking an evil corporation for a greater good, they are horrible people who enjoy causing havoc and will target anything just because they can, and enjoy doing so.