Steven Pinker on Liberalism

The momentum of social norms in the direction of Market Pricing gives many people the willies, but it would, for better or worse, extrapolate the trend toward nonviolence. Radical libertarians, who love the Market Pricing model, would decriminalize prostitution, drug possession, and gambling, and thereby empty the world's prisons of millions of people currently kept there by force (to say nothing of sending pimps and drug lords the way of Prohibition gangsters). The progression toward personal freedom raises the question of whether it is morally desiarble to trade a measure of socially sanctioned violence for a measure of behaviour that many people deem intrinsically wrong, such as blasphemy, homosexuality, drug use, and prostitution. But that's just the point: right or wrong, retracting the moral sense from its traditional spheres of community, authority, and purity entails a reduction of violenec. And that retraction is precisely the agenda of classical liberalism: a freedom of individuals from tribal and authoritarian force, and a tolerance of personal choices as long as they do not infringe on the autonomy and well-being of others.

Steven Pinker, The Better Angels of our Nature. Why Violence has Declined (Viking, 2011), 636-637.