Well, it will be until anyone is apprehended.

I think it is fair to say that Sony did "kick the hornet's nest." Is that what caused them to become a target for black hats? Unlikely. Whoever did this was likely looking for a big score, likely to try and sell the data to organized crime, and thus an ideological attack doesn't make a lot of sense.

However, it seems very plausible that some gray hats like Anonymous started kicking the tires of their security systems, and shared information that indicated things were looking lax, and that's what brought the black hats in.

If you're gonna be dumb, you gotta be tough. And Sony obviously wasn't.