The idea was almost distressingly simple: if Darwin says that the fittest are destined by nature to survive and if Nietzsche says that only the fittest should survive and that ideas such as empathy or solidarity are nothing but “slave morality,” then the only natural and moral result is rule by a race of strong and ruthless supermen, weeding out everything that is, or is perceived to be, weak and unable to impose itself on others. Of course, neither thinker had said any such thing.
