"The sneer against isolationism always was that isolationists were parochial, narrow-minded characters who don’t know that there is a world out there and want to hide their heads in the sand. In fact it’s the opposite – the true principle of isolationism is that the government should be isolated, the government should do nothing abroad and people who trade, interchange, and engage in voluntary travel, migration, and so forth should be allowed to peacefully do so. The idea is to isolate the government, not to isolate the country.
There’s another aspect, of course; this would apply to any government, but the thing is there is also an extra aspect – empirically it so happens that the American government since the days of Woodrow Wilson has been the main threat to the peace of the world, the main imperialist, the main embarker on a policy of meddling in every conceivable country every place in the world to make sure their government shapes up properly. So that the policy of American isolationism is more important for libertarian principle than any other country’s isolationism."