In the American liberal compass, the needle is always pointing to places like Denmark. Everything they most fervently hope for here has already happened there. So: Why does no one seem particularly interested in visiting Denmark? (“Honey, on our European trip, I want to see Tuscany, Paris, Berlin and . . . Jutland!”) Visitors say Danes are joyless to be around. Denmark suffers from high rates of alcoholism. In its use of antidepressants it ranks fourth in the world. (Its fellow Nordics the Icelanders are in front by a wide margin.) Some 5% of Danish men have had sex with...