Elevating the fallacy of the false alternative to a foreign policy, John McCain and a few others believe Republicans who oppose U.S. intervention in Libya’s civil war — and who think a decade of warfare in Afghanistan is enough — are isolationists. This is less a thought than a flight from thinking, which involves making sensible distinctions. Last Sunday on ABC’s “This Week,” McCain warned that the GOP has always had “an isolation strain.” He calls it “the Pat Buchanan wing,” which he contrasts with “the Republican Party that has been willing to stand up for freedom for people all...