Germany's wonderful Nietzschesque Fuhrer was a purportedly higher authority who set about creating a new and higher ethics for his Ubermenschen, and he didn't have much problem with declaring entire peoples subhuman and expendible.
a person who commands others to die because he wants their gold is not "nietzschesque." If Germans followed nietzsche's ideas they would not have been controllable, and the nazi party would have been an economic and social group with very limited power.
I actually trust the judgement of the people as a whole far more than I trust the top-down judgement of would-be elite rulers, people who seek to control everyone else as if they were children or herd them like cattle. I still support the old Athenian-style ideal of bottom-up democracy and believe in the soverignty of the people themselves.
that is not how we do it in america. It is rule of law by which a small group of people govern based in higher principles. It is not mob rule ochlocracy, and the founding fathers were very clear that it should not be that.
Regarding treatment of blacks it was specifically the interpretation of "separate but equal" laws by the Supreme Court, which demanded equality, which could not be implemented by mob rule in the south. Going further back, entrance into a civil war was also decided by a few people who interpreted higher principles not in accordance with the mob in southern states. The mobs in northern states had already, luckily, decided in favor of civil rights, in accordance with higher principles.
I am not saying the mob doesn't ever choose correctly, that would be a straw man to present towards my ideas. I am also not saying there hasn't been improvement over the centuries. Also, the Jews had laws prohibiting sexual use and abuse of slaves, for one thing, which was ahead of the times. If you want to say this is a problem, because god should have gone further I would agree that this seems like there could have been a more radical difference made, but definitely don't be ignorant and pretend the other societies were so nice and loving and the Jews and Christians were the bad guys about slavery. Slaves could not be kept beyond six years without the slave requesting it. Christian slave treatment depended on this short term oppression to be short term, as it even says "if you are about to become free, do so" basically saying if you have five or less years to suffer, do it, you will soon be free. He was no Martin Luther king of course, but he wasn't as bad as the Romans on this matter. Read up on it and tell me whose slave you would prefer to be between a roman and a Jew or Christian. Romans didn't even consider slaves to be people, long after the Jews gave them obligatory rights.
Or would it be morally incumbent on us to draw a line on principle, and to be willing to condemn God himself and refuse to obey his orders, if he violates our deepest moral intuitions?
I would say that ideally we would have an ethical principle, either secular, "do unto others", or religious, "love thy neighbor as yourself" which would be the foundational statement for human interaction. If a priest tells you to violate this, it is quite simple to assume that the priest has gone to the dark side, or whatever, and obey the first principle, rather than falsely attribute that to god asking us to violate first principles, as fundamentalist atheists and fundamentalist religious do when they say, "god is evil, because the inquisition" or "the priest told me to kill so that makes it ok." In the bible Jesus says all the laws are subject to one master law, which is "love god and love your neighbor as yourself". Atheists and theists misrepresent that all the time, but it is there, and that one statement cannot be honestly denied or rebutted.
As far as, not being commanded, I am not an anarchist, and don't believe, as they do, that people would act in accordance with good morality if they were just left to choose whatever they wished like gorillas. I wish we could all be relied on to even have higher principles beyond, "feel good", but I don't think we are doing that consistently, therefore we have the legal system. The ideal would be self-control I agree, and not control by others, as I hope to have pointed out by my response to "what about if god asks us to violate higher principles?"
Ps I have tried to address all three posters to my questions in this response by including what I saw as their points to this response, hopefully that worked rather doing two pages of specific replies. If there is anything I didn't address that would further explain my position, I would be happy to do so.