Even though this is true, it would have been impossible for a fringe group to have pulled off such an organised assault.Andy Chalk said:But the ethereal nature of the group's "membership" is precisely what makes it so difficult to determine - or deny - its involvement. Simply put, Anonymous is open to any who claim it, which makes it difficult, if not outright impossible, for any kind of centralized leadership to claim that it wasn't involved. Denial requires definition, which is an effectively impossible task; so while Anonymous may not have been involved, it's still quite possible that Anonymous was, well, involved.
Also, Anonymous has never nor would they ever steal credit card information. It isn't just that they are posting ideals to the public, it's the public that 'joins' because of their ideals. They just wouldn't be able to pull off something like this without it getting out, even if they claimed they didn't.
It also should be mentioned that the IRC channel is open to pretty much anyone, so if they were going to attack Sony, it would have been announced there.
Also, Anonymous has never shied away from admitting responsibility before.