“de rigeur for <X> and <Y>” means “required by current fashion for all of X and Y” not “practiced by some subset of X and Y”.

You seem to be retreating from the claim that Columbus’s behavior as governor was in line with the universal practice of his time to the much weaker and less controversial claim that it was both in some way influenced by the social context of his time and not uniquely bad in the contemporary (overlapping) “European and Muslim” world.

Which, sure, nice motte and bailey, Columbus was quite possibly not the single most abusive European and/or Muslim territorial governor of the late 15th Century.

(You also seem to want to argue about claims about Mesoamerican civilizations which I did not argue against, for whatever reason.)