"To have a passion for justice, one must have a theory of what justice and injustice are."
The true test, then, of the radical spirit, is the button-pushing test: if we could push the button for instantaneous abolition of unjust invasions of liberty, would we do it? If we would not do it, we could scarcely call ourselves libertarians, and most of us would only do it if primarily guided by a passion for justice.
The genuine libertarian, then, is, in all senses of the word, an "abolitionist"; he would, if he could, abolish instantaneously all invasions of liberty, whether it be, in the original coining of the term, slavery, or whether it be the manifold other instances of State oppression. He would, in the words of another libertarian in a similar connection, "blister my thumb pushing that button!"
Read more: http://mises.org/story/2993