Friedrich Nietzsche spoke of the “transvaluation of all values”: the inversion of our conceptions of good and evil in this post-Christian era. What had been regarded as good—humility, self-denial, obedience, love of the poor and of poverty, looking towards a world to come—was, in his system, to be seen as evil, and what had been regarded as evil—imposing one’s will by domination, satisfying one’s lusts, crushing the weak, dismissing thoughts of an afterlife, living for the moment—would now be virtues. The Übermensch or Superman would be the exact contrary of the Christian saint.As the atrocity of abortion demonstrates, Nietzsche’s view...