I didn't see the movie.   I have doubts about the hacking, and who did what.  And even if this was all a misguided stunt to bring more people to the box office, I'm glad it happened.
This story dominated the news, why?  Because people were angered that their "right" and "freedom" to consume entertainment was threatened.   If Sony had simply been hacked by someone trying to access their business accounts for money,  we wouldn't have batted an eye.  I'm sure it happens all the time, but nobody hears about it, and nobody cares.  
Just like nobody cares about the citizens of North Korea.  We love to laugh and joke about Kim Jong Un, and Kim Jong Il when he was alive, and the crazy shit they do over there.  However while we're bitching about not being able to watch a movie - Korean people, and 3 generations of their family can be sentenced to public execution just for watching a film that their government didn't make or approve of.  
With an internet usage rate of less than 1 percent of their population, they are by far the most isolated people of the modern world.    All information they have access to is filtered and skewed by the government, and made into pro-government propaganda, that is enforced. The government rules all aspects of each citizen's life, right down to the way they keep their hair, and even what they think.  They are taught to believe that their leader can read their thoughts, and children are told not to even think to question the government because of it.  We only know this from the very few who were able to escape North Korea (estimated between 120,000 and 320,000 people since 1953).
We joke about these rules because we feel immune, and find it difficult to understand how anyone could live under such control.   I don't think it's funny.  I don't think it's right to laugh about the holocaust either... but at least the holocaust is over, and Hitler is no longer the threat he once was.  (Side note: Did you know that Canada responded to the attack on Pearl Harbor before America did?)