Libertarians say: what about individual rights? The question boils down to this: how many robbers must there be before robbery is no longer a crime? How many rapists must there be before it is no longer rape? We all know logic. A crime is a crime, no matter how many people are involved. If the majority of a town goes out and lynches someone, it is still murder. Majority rule often leads to mob rule, which tramples on individual rights and self–ownership.

p. 196 (Chapter 23, The Libertarian Philosophy and Taxation") - Facets of Liberty: A Libertarian Primer, 2009