A good reflection on how you can be wrong about the most important things. I like the comments section especially, because it shows people reflecting on the question in their own lives.
I think I was wrong about isolationism in the 1990s. I was really against intervening in Somalia, and then in Bosnia, Serbia, etc. I thought that was none of our affair, and that we should let these people kill each other if they wanted to do so. I agreed with Otto von Bismark's opinion that the "whole of the Balkans is not worth the bones of a single Pomeranian grenadier." If you'd have suggested to me that, just a few years later, I would support an American invasion of Afghanistan I'd have laughed out loud.