Are you a moral relativist?
Partly as a result of looking at ethics as an unsolved problem, partly as a result of "not my problem", partly as a result of my indescribable hatred of the Papacy. Differing partial solutions are expected, aligning them in an outside group is a
massive pain in the ass liable to cause severe societal damage, and strict moral objectivism makes correcting for corruption a nightmare.
The idea that rulers were held accountable to morality is hardly unique to Christianity. You find obvious precedent for that in Judaism, who's kings were constantly held to the same moral standards as the people by the Prophets and God. But then, this is logical considering Christian moral thought is directly descended from Jewish moral thought.
The Judaic tradition that resulted in the "Happy Merchants" from their morality being
very literally contractual and thus one of the
very strongest pre-modern cases of relativism?
Further Judeo-Christian thought was hardly the only place the idea that rulers had to be beholden to common morality appeared, you saw that same idea crop up in both Greek and Roman political philosophy, and China especially has a long philosophical tradition discussing the moral standard rulers are held to.
My emphasis here is on "common" morality and "elite" morality being formally separated categories, in terms of what's "bad" to do. The Christian "Divine Right of Kings" was not permission to ignore
any moral behaviors the general population was held to. In comparison,
a lot of previous systems had no pretenses about right to rule being owed to a priviledged
moral position with
extensive legal double standards that make the shit Magna Carta stopped look like nothing.
It's a major dialogue within Confucianism, with both Confucius and Mencius writing about how rulers are held to moral standards and are not above morality, as well as the Taoists. Granted, they also had a philosophical school that basically DID grant allowance to the rulers to do anything, but Legalism is kinda a notable EXCEPTION in that regard.
The ossified clusterfuck that pardoned most of the shit a pirate queen got up to as an automatic function of giving her a noble title held the ruler to the
same moral standards as the common laborer? Are you sure about that?