The president of the United States will release a binder full of new gun-control executive orders on Wednesday. Instead of standing alone, bearing full responsibility for the imperial actions he is about to take, President Obama will surround himself with an audience of kids who wrote to him after the Newtown, Conn., school massacre. This is the most cynical in Beltway theatrical staging — a feckless attempt to invoke immunity by intoning “it’s for the children” and hiding behind them. What has happened to the deliberative process in this country? Public debate in Washington has deteriorated into Sesame Street sing-alongs....