Even in the liberty movement, there are people who disregard physical defense as either barbaric or “futile” and have adopted rather less-effective pacifist ideologies of more socialist activism. The problem with certain factions of libertarianism is that they tend to live within their own heads, reveling in a world of Ayn Randian and Rothbardian political and social theory, while abandoning the other side of concrete resistance. Some in the survival community call these people 'egghead libertarians', and I think the label fits.