Libertarianism vs. Radical Capitalism/existence
From Critiques Of Libertarianism
The essential unifying idea in this core of libertarian ideology is that the existence of rights and the propriety of liberty are either obvious, or matters of faith, or sufficiently explained by the word “natural”; accordingly, deeper moral or philosophic arguments in support of them are unnecessary. Why provide philosophic arguments for that which people can know by just opening their eyes, or closing their eyes, or waving their hands and saying “natural”? The fact is that people do not and cannot know anything about the nature of rights or the propriety of liberty by such means.
Craig Biddle, "Libertarianism vs. Radical Capitalism"