The N.K. regime has had many chances, it's in the news just about Daily. What's stopping the US is the North having tons of missiles to reign in on Seoul. The S.Korean general population could give a hoot if the North developes a missile to Nuke the US. S.K.'s young Joe/Jill 6packs who were dressed respectably responses were, the US has our backs, they feel safe, they ain't loosing sleep over this. Nice, Safe, in a Democratic Society that daddy's watching over them.  SAD, from what I read the US is picking up the install for the missile defense system. Need we Figa? It'd be nice to have the S.Koreans in the front of this mess, the commies could just run over the South if you ask me.
The S.Koreans are in LaLa Land enjoying the good times.