(Thanks to Tim Maguire for sharing this.)

Libertarians spend their lives accurately predicting the future effects of government policy. Their predictions are accurate because they are derived from Hayek’s insights into the limitations of human knowledge, from the recognition that the people who comprise the government respond to incentives just like anyone else and are not magically transformed to selfless agents of the good merely by accepting government employment, from the awareness that for government to provide a benefit to some, it must first take it from others, and from the knowledge that politicians cannot repeal the laws of economics. For the same reason, their predictions are usually negative and utterly inconsistent with the utopian wishful-thinking that lies at the heart of virtually all contemporary political advocacy. And because no one likes to hear that he cannot have his cake and eat it too or be told that his good intentions cannot be translated into reality either by waving a magic wand or by passing legislation, these predictions are greeted not merely with disbelief, but with derision.

John Hasnas, Georgetown University, January 2009