Gerard Casey, an Associate Professor of Philosophy at University College in Dublin, Ireland, and an Adjunct Scholar at the Mises Institute, has written a concise, excellently sourced treatise promoting the political philosophy he labels “libertarian anarchy.” Professor Casey writes in large part from a Rothbardian perspective, as one sees by his very first sentence: “States are criminal organizations.” He distinguishes libertarianism from libertinism, noting that libertarians may live by strict moral principles, yet “the law has no business enforcing purely moral considerations.” Casey...