Over a decade ago, I wrote an article published at Mises.org on the libertarian immigration conundrum. The “conundrum” was the seemingly unbridgeable differences between, if not contradictory views of, the two libertarian answers to the immigration question. The point of the article was to show that these answers are more compatible than most libertarians tend to think; both, in fact, espouse the non-aggression principle, but they emphasize different aspects of it. Since then, however, the debate has become more polarized and it has more or less caused a rift within the libertarian movement....