Just because he is supreme leader does not make him right, or wise, or anything positive. A leader does not have to be any of those things, they merely need the backing of a sufficient number of foot soldiers who benefit from the leaders favour.
Remove that favour, and the foot soldiers will simply install another leader in their place.
These capitalist imperialist pigs think they know better and they may doubt the maxims of our divine leader Kim Jung-on? They are brainwashed by democratic anti-proletariat dogma that causes them to develop delusions. The glorious leader was put on Earth by the gods themselves (Who do not exist because religion is anti-communist) and to doubt him is to insult divinity. Hail the glorious leader!