Heartbreaking news, and a demonstration of the limit of remote-control warfare. The US drone program in Pakistan inadvertently killed two Western hostages being held by al-Qaeda, including an American whose family had repeatedly appealed for his release based on his age and health: A U.S. drone strike in January targeting a suspected al Qaeda compound in Pakistan inadvertently killed an American and Italian being held hostage by the group, senior Obama administration officials said.The killing of American development expert Warren Weinstein and Italian aid worker Giovanni Lo Porto is the first known instance in which the U.S. has accidentally...