What's Wrong With Terrorism?

Terrorists perform terrible acts. They maim, mutilate and kill in pursuit of their goals. The horrifying events of 9/11 and the regular suicide bombings around the world have made terrorism one of the central preoccupations of the twenty-first century. But what is the distinctive wrong of terrorism? Criminal acts such as murder and hijacking are already on the moral statute books, so why is it that we regard terrorists as different from and morally worse than ordinary killers and kidnappers...