The behavior of the Paulnuts on the Mackinac ferry, noted by David, is a common consequence of pacifism and extreme libertarianism. Both think the state at war is the worst thing in the world. (Extreme libertarians think the state doing most everything else is also bad.) Most—maybe all—libertarians acknowledge a right to self defense. But in the modern world this cannot be done by militias. It requires a military industrial complex, with all the attendant consequences. Some libertarians accept this fact (while proposing modifications). Extreme libertarians do not; therefore they support self defense only in theory. In any actual situation,...