I like a lot of the replys i'm reading, I'm glad a lot of people are actually viewing the groups past actions and drawing a conclusion.
A few points/corrections on anon
For those of you saying they aren't claiming the attack because it would make the gaming community mad, you seem to forget who exactly you are accusing. This is the group that points and laughs when people rage like this. They simply don't care how you feel.
If it was a few within anon, it was the more skilled individuals who did it without bringing up the plan with the rest of the "hive". Although anon has been internally split before on issues, there was always a fairly large group for the plan. Going against the entire hivemind of anon, means you are not acting on behalf of or part of anon while doing this.
Some of you are also forgetting that these more skilled members are still ducking various police organizations for what they did to H.B. Gary (Highly illegal, but I got a laugh from it), and past actions, so doing another highly illegal thing to such a huge target would only get them caught sooner. While anon doesn't always make the smartest choices, they know when to lay low and watch things burn.
I still blame sony though, such a large hole should have been caught in testing. They also should have been using a 256 bit encryption instead of a 128, atleast for the credit information.