"we should be undermining him at every turn, every opportunity to encourage a revolt should be taken. WE should turn some members of their armed forces against him, provoke a coup. Where is our CIA? They're so good at causing revolutions in Latin America why not N. Korea?"
Because that has worked SOOOOOO well with other countries in the past, right?
America likes to conjure up all its enemies as 30 foot tall monsters with big sharp teeth and rattly claws, waiting patiently under the bridge to blow our peaceable, Jesus loving nation to kingdom-come.
Reality doesn't quite jive with that. North Korea is extraordinarily WEAK, and being weak, they should be dealt with, not by applying pressure, but by allowing them to decompress, slowly and stably.
Condition cutting American forces on the Northern border of South Korea in half by asking NK to allow the Russians and the Chinese to deploy a preset number of troops to the country's southern border.
Then slowly draw down both sides over the period of several years.
No coup. No instability. No war.