I'm not sure lack of concern is the operative constraint. What would you want the South Korean government, or anyone else, to do to liberate the north?
There's nothing wrong with a moral aspect to policy objectives, but all policy objectives, moral and otherwise, are constraint by a limited range of realistic policy options. Liberating the north and raising the population's standard of living to that of the south is a lovely and moral objective, but without a realistic strategy for achieving the objective, what's it worth
Certainly it's a threat, but trying to force or impose an unwelcome change on a failed state with weapons of mass destruction also poses risks.
If anyone has a realistic proposal for a way to "fix" North Korea without a war (thought to be undesirable), I'm all ears...
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