Many of the same slashdotters who accept "experts" who claim NK didn't hack Sony will readily accept as truth that it was "obviously" the US that attacked NK, even though there is even less objective proof of that, and could just as easily be some Anonymous offshoot, or any number of other organizations, or even North Korea itself.
See the logical disconnect, here?
For those now jumping on the "North Korea didn't hack Sony" bandwagon that some security "experts" are leading for their own political or ideological reasons, including using rationales as puzzling and pedestrian as source IP addresses of the attacks being elsewhere, some comments:
Attribution in cyber is hard, and the general public is never going to know the classified intelligence that went into making an attribution determination, and experts -- actual and self-appointed -- will make claims about what they think occurred.
With cyber, you could have nation-states, terrorists organizations, or even activist hacking groups attacking other nation-states, companies, or organizations, for any number of motives, and making it appear, from a social and technical standpoint, that the attack originated from and/or was ordered by another entity entirely.
That's a HUGE problem, but there are ways to mitigate it. A Sony "insider" may indeed -- wittingly or unwittingly -- have been key in pulling off this hack. That doesn't mean that DPRK wasn't involved. I am not making a formal statement one way or the other; just saying that the public won't be privy to the specific attribution rationale.
Also, any offensive cyber action that isn't totally worthless is going to attempt to mask or completely divert attention from its true origins (unless part of the strategic intent is to make it clear who did it), or at a minimum maintain some semblance of deniability.
At some point you have to apply Occam's razor and ask who benefits.
And for those riding the kooky "This is all a big marketing scam by Sony" train:
So, you're saying that Sony leaked thousands of extremely embarrassing and in some cases damaging internal documents and emails that will probably result in the CEO of Sony Pictures Entertainment being ousted, including private and statutorily-protected personal health information of employees, and issued terroristic messages threatening 9/11-style attacks at US movie theaters, committing dozens to hundreds of federal felonies, while derailing any hopes for a mass release and instead having it end up on YouTube for rental, all to promote one of hundreds of second-rate movies?