What is it in the operatic Italian psyche that allows-indeed, forgives, even applauds-Italy's premier for conducting a lifestyle as decadent as a Fellini extravaganza, while organizing an ongoing string of questionable behaviors and politically incorrect gaffes not seen since the days of Nero? All this, and yet Mr. Berlusconi remains completely "understood" by so many of his countrymen-some of whom keep coming back for more Best-selling writer Beppe...