In an Alexandria, Virginia, courtroom, Zacarias Moussaoui and the federal government are acting out for the nation and the world a small drama about revenge. It is hardly clear who will savor revenge more: the defendant who seems likely to be strapped to the executioner’s gurney soon, or the state that injects the lethal combination of fluids.

President Bush famously said that his administration took the battle overseas so that we would not need to fight the war at home. Revelations about the NSA’s warrantless domestic spying suggest that this formulation has the administration’s logic backward: The authority to conduct war elsewhere has been treated as permission to bring the tools of war back home.