As American foreign policy continues its long string of failures—not a series of singles and doubles, as President Obama asserted in a recent news conference, but rather season upon season of fouls and strikes—the question becomes: Why?

Why does the Economist magazine put a tethered eagle on its cover, with the plaintive question, "What would America fight for?" Why do Washington Post columnists sympathetic to the administration write pieces like one last week headlined, "Obama tends to create his own foreign...