“The instability of evil,” said Whitehead, “is the morality of the universe.”
Evil is autophagous, is self-vitiating. It subjects itself to an ontological expression of the argument from retortion. This is easy to see if we look at the very most evil acts, as murder, aggressive violence, and so forth; who lives by the sword dies by the sword, for his fellows cannot ultimately tolerate the risk he poses to them.
Again, with respect to abortion, the logic of the gedanken policy test is difficult to assail: a society that abjures abortion will outbreed one that does not, all other things being held equal. The logic of being is such that tolerance of abortion is disastrous for the toleration of abortion. Because pro-lifers outbreed pro-choicers, the latter are going to vanish, sooner or later. That’s all. For pro-choicers who take advantage of their choice are preventing the reproduction of their view of the world.
These results demonstrate that the order of the universe, the very math of reality, contravenes evil. We are free to conduct our lives in disagreement with that order of things, but there is no escape from it; so that such disagreements must eventually end in disaster. Against such disasters, when they arrive, any arguments we might propose will be bootless.
Liberalism may indeed take the whole of society. Such things are possible, at least in principle. But it cannot then but destroy itself, by destroying society. The liberal society, that does not believe it is right to defend itself, will be crushed by some other society, that does.