There is no way North Korea had the sophistication to hack SONY. Hacking requires knowledge of the latest security vulnerabilities. It's impossible to develop good hackers on such a censored network.
Hacking doesn't necessarily require sophistication.
> Hacking requires knowledge of the latest security vulnerabilities.
Again, no.
> It's impossible to develop good hackers on such a censored network.
Also no. I can imagine being on a heavily censored network being a prime breeding ground for great hackers. Either way, if I were a nation state sponsoring a hack I would presumably give uncensored access to my hack team.