Laurence writes, "[I]f anyone should be written out of the libertarian movement it is not those who reject open borders, but those who believe in sending U.S. troops over our borders into other countries to bomb, maim, and kill for the state."

I sympathize. I am an "open-borders" libertarian myself — in that I oppose any government regulation of migration, border walls, guards, etc. (though I believe in the sanctity of private boundaries, including along political borders) — and Laurence and I politely disagree on my extreme position here, but there are a lot of issues libertarians seem to disagree on. War, however, fuels leviathan and cannot be separated from it. If anything should disqualify one from libertarianism, it is warmongering.

I am confused by libertarians who would write out skeptics of open borders yet not write out the liberventionists, as if it is obviously wrong for the state to keep foreigners out, but not so obviously wrong for the state to murder them.