Photo: Stuart C. Wilson/Getty Images There go the royals, shaking hands and cradling bouquets and reminding us all that they’re there, that they’re working, that they have, in their parlance, a “role.” The “walkabout” — the art of working rope lines to greet and appease the public, perfected by Queen Elizabeth in the early 1970s — is one preferred medium for asserting their existence. Another, the royal tours to Commonwealth countries and foreign allies, are just walkabouts at 100 times the cost and press coverage. The dukes and princesses and consorts move through the crowds and drop tiny crumbs of...