All right, you win, forcible Korean reunification is impractical. I remain skeptical about whether North Korea is currently nuclear-capable, though, so there is relatively little risk of some rogue commander going nuclear.
Still, the fact remains that South Korea has been attacked, and they are our ally. If the North launches an invasion, then of course we will help the South to win the war. If the South responds to this recent attack and it escalates to war, then we should still back them.
I do think the Korean Peninsula will be reunited eventually. The North cannot continue in the same way forever; eventually they will collapse.
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WAR IS PEACE
FREEDOM IS SLAVERY
IGNORANCE IS STRENGTH