The facts of human progress strike me as having been as unkind to right-wing libertarianism as to right-wing conservatism and left-wing Marxism. The totalitarian governments of the 20th century did not emerge from democratic welfare states sliding down a slippery slope, but were imposed by fanatical ideologues and gangs of thugs. And countries that combine free markets with more taxation, social spending, and regulation than the United States (such as Canada, New Zealand, and Western Europe) turn out to be not grim dystopias but rather pleasant places to live, and they trounce the United States in every measure of human flourishing, including crime, life expectancy, infant mortality, education, and happiness. As we saw, no developed country runs on right-wing libertarian principles, nor has any realistic vision of such a country ever been laid out.

It should not be surprising that the facts of human progress confound the major -isms. The ideologies are more than two centuries old and are based on mile-high visions such as whether humans are tragically flawed or infinitely malleable, and whether society is an organic whole or a collection of individuals. A real society comprises hundreds of millions of social beings, each with a trillion-synapse brain, who pursue their well-being while affecting the well-being of others in complex networks with massive positive and negative externalities, many of them historically unprecedented. It is bound to defy any simple narrative of what will happen under a given set of rules. A more rational approach to politics is to treat societies as ongoing experiments and open-mindedly learn the best practices, whichever part of the spectrum they come from.

Steven Pinker, Enlightenment Now: The Case for Reason, Science, Humanism, and Progress, New York, 2018, p. 365