Who is a libertarian?
A libertarian is a person who believes that the invasion of the borders of (trespass against) others’ bodies or owned external scarce resources, i.e. property (with property allocations determined in accordance with Lockean homesteading rules and contractual transfer rules), is unjustified, because they (for whatever reason) prefer or value grundnorms of peace, prosperity, and cooperation and who have enough honesty, consistency, and economic literacy to recognize that the libertarian assignment of property rules is necessary to achieve these grundnorms.
by Stephan Kinsella