Look at China's attitude towards everything going on in the world.
The only thing China is concerned about is their own stability and economic growth.
They didn't openly pick a side in the war on "terrorism".
No reaction to the conflict in Libiya, or any other conflict going on in the world.
Their only reaction was to shorten the leash on their own people. (I know because I live in Beijing).

China wants nothing to stand in the way of their growth.
They used to be North-koreas only ally, they still are. But they are now backing away from that as well. Asking Kim Jong ill to stop the nuclear projects.
But still being friendly to North Korea, to not anger any side.

I don't think they will risk foreign relationships by hacking people like this. Only if they feel it is justifiable.

This poll really doesn't say anything.
It's in percentages so 21% of a 20 year old is much less than 21% of an 80 year old.

I made my first e-mail at school, everybody in the class needed to have one, with the class name in it. There were some people who still used that email address 5 years later, when in College.

You sign a contract with Apple, you have to follow the rules stated by the contract.
You don't sign a contract but just buy the products retail, you can do whatever you want (within the law).

If you haven't noticed yet, these people can get really good at anything they set their mind to. They have crazy work ethic, they can work themselves to death. Of course there is not much to do in North Korea other than work and sleep. And having your family hold hostage probably helps too. You do know how they identify the potential hackers? They pick them from geek forums like this.