Of course North Korea didn't attack Sony. Asking "Did North Korea really attack Sony?" is like asking "Does NORAD really track Santa?"
The North Korea story was spin to save Sony from the devastating bad publicity about the depths of their business and technological incompetence. (The politicians who defended them will get repaid for this favor during the next election cycle. My previous comment about this from last week: They may even start using this to try to rescue that disaster of a movie. "You have to see 'The Interview'! To support free speech and America!")
The Dear Leader Of The Free World announcing "don't blame poor Sony, they were helpless victims of the evil North Koreans" totally changed the media story, saving Sony huge $$$ in both public perception and future lawsuits.
But just how America's President and trillion-dollar national security state could get things so wrong - but should always be trusted when saying who's bad and deserves to be killed, like some kind of psycho-Santa delivering death from his sleigh filled with drones - will never be questioned.
Businesses and politicians will never stop lying when it works this well.