EVEN by the stupefying standards of Iraq’s unspeakable violence, the murder of Atwar Bahjat, one of the country’s top television journalists, was an act of exceptional cruelty.Nobody but her killers knew just how much she had suffered until a film showing her death on February 22 at the hands of two musclebound men in military uniforms emerged last week. Her family’s worst fears of what might have happened have been far exceeded by the reality. Bahjat was abducted after making three live broadcasts from the edge of her native city of Samarra on the day its golden-domed Shi’ite mosque was...