Easy enough for a scholar such as yourself to conclude but what about people of very low intelligence, or dullards and simpletons who possess moral imperatives without any reflection?
A simpleton, dullard, child, vegetative human being, etc.. who does not possess the faculties of comprehension necessary to restrain his own behavior consistent with morality, cannot be held to a moral standard. Their actions are effectively amoral.
That is why we afford stewardship to these individuals.