Then maybe I misunderstood. I also think the necessity of law is related to the necessity of moral language. I just don't consider it a control structure in a pejorative sense in and of itself, until someone uses to exert control over a society for some purpose other than its original purpose, like repurposing a defense mechanism as a weapon. While I somewhat understand Nietzsche's revulsion to the situation he found himself in and his drive to look backward, ancient greece for me is not comparable to a point of origination for humanity, and in my opinion his master/slave morality dichotomy doesn't go back far enough.

You're making the assumption that the people who wield moral authority use that control to prevent harmful actions, in general. Frequently, that is not the motivation of people with moral power. Frequently enough that it is innaccurate to say that moral control of the masses is categorized as "good" in and of itself.