Strange you would quote Nietzsche, as he could be categorized as a nihilist in the descriptive sense. He believed that there was no longer any real substance to traditional social, political, moral, and religious values. He denied that those values had any objective validity or that they imposed any binding obligations upon us. I’m not that far gone, but I certainly understand the sentiment.
I also subscribe to some of the teachins of John Calvin, and Thomas Hobbs, when I learned the comic strip calvin and hobbs was based off of the two men. But from my viewpoint while nihilistic, Nietzsche had some views on human morality, like in Beyond Good and Evil, I interpreted it to basically him saying your damned if you do, your damned if you don't. But with his works, you can almost see a pattern that could be woven into a tapestry of my personal philosophy of Fuck it.
Fuck it, is simply put, my notion that you can be a good person, with or without religion, or even societal influence, its just having to over come baser desires, that if left unchecked leads people to doing bad or wrong things. But, also being too righteous is just as toxic, as while you may be viewed as a paragon, there will always be that one moment in life where you will be brought low, and exposed. Not as a fraud, but as a human. Because I have seen and read so much on people who set themselves up, by choice or by others to be "good" and that one moment of understanding would shatter a thousand moments of hiding behind the mask of virtue.
Also a firm believer in "The road to hell is paved in good intentions." That is why I vehemently distrust people who say things like "For the greater good, or The right side of history." As if they were appointed by some high power to be the judge of all that is good and right. And will they be victorious, because last time I checked, history was written by the people who won.
But all in all, Nietzsche fascinated me in high school, and into college, as everyone assumes he was a nazi sympathizer, but in reality, it was his sister, after he went insane who stolen his works and turned it into propaganda.
Just like Voltaire and Alighieri. Voltaire was a biting, critical political satirist, as was Alighieri. The Inerno was a big fuck you towards his rival political faction, the white Guelephs (sp) and everyone he seen during his time fucking shit up. Remove religion from it, and you got a long political hit piece on most major Italian political figures at the time.
I also truly loved "The Prince" by Machiavelli. "A good ruler must be feared by his people rather than loved. For if he is feared, the hard choices he has to make for their survival will be accepted with little resistance, but if he is loved, when he has to make the hard choices, he will face their scorn and betrayal."