IN THE POST BELOW, I ask if we should have stayed home in World War II. That’s not an entirely rhetorical question: Some people thought so then, though they quickly shut up once the war started. But I’m reading Harry Turtledove’s In the Presence of Mine Enemies — in which the United States did just that — and I think we’re better off still stuck in the European “quagmire” than we would have been if we’d tried to stay out.