These days the North Korea leader is a thirty-year old with a liberal Swiss education. Do you think you could do much better than him without getting killed?

Better at what? Playing the dictator game? Being benevolent? Yes, dictators need to keep their henchmen happy. No that doesn't make them benevolent, or make dictatorship equivalent to democracy, or whatever the wider point is supposed to be.

People don't need to be immune to corruption by power to overthrow a government.

So a thug gets overthrown and replaced by another thug? What's the wider point?