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Not really. That's still just option 1, but with a naturalistic explanation for why society arrived at the current state of prevailing opinion. The highest standard of morality remains nothing more binding than maintaining the status quo set by society at large, and that means there isn't really anything binding at all, since the prevailing opinion of society can and has changed. The next non-conformist movement may be temporarily seen as immoral, but come to take the crown as the predominant opinion of society, proving its evolutionary advantage over the opinion it supplanted. Does it then move from being immoral to moral due to having become the prevailing view? Hogwash, all of it.