Whatever gives you the results you want is good, and whatever gives you results you don't want is bad.
What does this have to do with anything? Do you feel like a slave? Also, a master and a slave is a much smaller scale than all of society. As long as you think the whole world has to burn because someone did something mean once, yeah, you're going to feel like a slave. That's kind of what slave morality is, but you seem to have missed the point.
so·ci·e·ty
noun
the aggregate of people living together in a more or less ordered community.
Are cures for cancer not natural? Is peace not natural? Societies that don't practice human nature are certainly natural! It's natural for predators to eat prey and it's natural for trees to grow. It's natural for rivers to run and for winds to blow, and it's natural for water to freeze and the air to be still. Lots of things are natural. The key to nature is to understand it and use the laws of nature for your personal benefit, not to emulate nature. I literally used engineering as an example. An engineer learns physics and builds a machine.
And no, unnatural societies are not part of nature. Unnatural societies die. Feudalism ended, human sacrifice on a social scale ended, chattel slavery ended (though many other forms still exist.) You can force societies to go against what the laws of nature dictate for a time like you can force a square peg into a round hole by hammering it hard enough. Eventually it'll come out, though. So don't force it. Study the world and use your knowledge of its laws.
No, mostly because the Europeans didn't beat the Natives. Lots of Natives are still around, and some of them are heads of their respective states as well as other highly-accomplished individuals. Some of the natives that aren't around, though... well, back to your point about human sacrifice...
...I'm glad that's not around anymore. That is to say, it's no longer a part of nature because it was going against nature, and people were trying to force it into existence.
How's your so-called authority working for you?
Hı̇tler was in Russia during the winter. Did he withdraw from Russia in the winter? No, he just let his troops get slaughtered because he didn't know how bad Russian winter was. It doesn't even matter when he began the invasion, he still thought meteorology was a social construct and
the world was made of ice.
The fact there were way more than 300 people from all over Greece, yet the 300 Spartans claimed all the credit might've had a lot to do with that. Also they lost. How is a loser ever more powerful than a winner? That's like saying the Axis were more powerful than the Allies... oh, wait, that's exactly what you do think. I hope you feel so proud of being powerful enough to get banned, among all the other things that seem to be working out so well for you.
“I don't want to achieve immortality through my work; I want to achieve immortality through not dying. I don't want to live on in the hearts of my countrymen; I want to live on in my apartment.”
― Woody Allen
“I now go alone, my disciples! You too go now, alone! Thus I want it. I advise you: depart from me, and guard yourselves against Zarathustra! And better still: be ashamed of him! Perhaps he has deceived you.” — Nietzsche,
Thus Spake Zarathustra