Libertarians are split on the controversial issue of immigration (as is the rest of the population). The open borders libertarians claim that immigration is not a per se violation of the bedrock of libertarianism, the non-aggression principle (NAP); therefore, any violent interference with cross-border travel, such as limits to immigration, is incompatible with this philosophy. Their opponents within this community of scholars maintain the very opposite; that free untrammeled migration amounts to trespass. Their case, of late, has been strengthened by the debacle in Germany, Sweden and other European nations who have taken in migrants by the thousands, and have been repaid by a massive increase in rapes and thefts on the part of these foreigners.
A Response to the Libertarian Critics of Open-Borders Libertarianism,
Available at: https://digitalcommons.lmunet.edu/lmulrev/vol4/iss1/6