Can’t run a dictatorship without an army. Ergo, the dictator “rules” at the army’s pleasure and the army really runs the show. If Kim the heir wants to live long enough to fill his father’s miniature shoes, he will have to toe the line and spout the rhetoric.
The newest Kim is the most obvious symbol of this regime, but the point is just as valid for every member of the royal family, the entire party cadre and all the flag rank army brass.
I am sure they all remember the fall of the Communist Bloc -- what happened to Nicolae Ceauşescu haunts their sleep.
They probably imagine hordes of starving people descending on Pyongyang. People starved and abused to the point where they just don't care anymore.
All the Army's guns might not help them then. And if the junior soldiers and officers join in...