No more words needed to describe it.
Just out of interest, how do you know?
If not, why do they forbid basically anyone of their people to leave the country on his own?
But is it done for no other reason that the leadership are evil? I think not. Clearly they're being very controlling, but what's the reason for that? I suspect that "being evil" isn't even one of the reasons why the leadership have very tight controls in all sorts of areas.
Cite other North Korean government controls.
a) intended to be evil ? If not, what's the real intention?
b) even true at all? How do we know it's true, when the place is so strictly controlled?
Yes they do, particularly if they achieve their aims. I'm not sure that you're imagining the fullest possible range of intentions here. How about: intending to preserve their society by way of aggressively removing any chance of outside influences? That's not control for it's own sake, or for some sadistic satisfaction, it's a very introspective and unambiguous way to keep external influences out. The Japanese did this for many centuries throughout the Middle Ages, until the West "liberated" them.