Why is it never "Never Again?"

Anne Applebaum writes in today's WaPo about North Korea's brutal prison system, rivaling anything from Nazi or Soviet times. This information is well documented, yet no one--most particularly South Korea--cares. Why?

In recent years a plethora of respectable institutions -- the Vatican, the U.S. government, the international Jewish community, the Allied commanders -- have all been accused of "allowing" the Holocaust to occur, through ignorance or ill will or fear, or simply because there were other priorities, such as fighting the war. We shake our heads self-righteously, certain that if we'd been there, liberation would have come earlier -- all the while failing to see that the present is no different. Quite a lot has changed in 60 years, but the ways in which information about crimes against humanity can simultaneously be "known" and not known hasn't changed at all. Nor have other interests and other priorities ceased to distract people from the feelings of shame and guilt they would certainly feel, if only they focused on them.

My question: Did we not mean it then, or do we just not mean it now?