The balance of the human world was that, fundamentally, everyone was equal. Yes, there was inequality that came from prejudice, from resources, from birth conditions. But fundamentally, everyone was human. Everyone would die to a knife through the back, a bullet through the skull, or from falling a dozen stories.
For this reason, no matter if it was a king, a president, or a powerful CEO, they had to be wary. If they were too 'evil' and committed too many bad deeds, eventually, they would face karma. Karma didn't have to be administered by the Heavens, or some other strange all powerful entity. It was simple… if you committed bad deeds all year round, eventually a mistake would be made.