My feelings about Anonymous are mixed. I like a lot that the group tries to stand up to "the big guy", but their means sometimes go a bit too far. The whole PSN thing for example was successful in teaching Sony a lesson or two, but look what it did for the average user... was it really worth it?
Probably just some idiot in a Guy Fawkes mask. People just wear those thinking it makes them look so cool and rebellious. I generally approve of what "Anonymous" does though. Most of it is well deserved.
1) It could be a guy who wants to take credit for the hack to merely get attention when in doubt he actually didn't do it.
2) It could be a guy who just wanted to wear the mask.
3) It could be a guy who was suckered into wearing it to draw attention away from the real hacker.
I doubt that guy was the actual anon who caused the PSN crisis, but I do believe the real hacker was there to see if they commented on his handy work. It's like an arsonist, most come back to the scene of the crime to witness what they've wrought.