Amar Ahmed Mohammed was 19 years old. But the fact that he had the mind of a four-year-old did not stop the insurgency's hard men as they strapped explosives to his chest and guided him to a voting centre in suburban Al-Askan. Before dawn yesterday in Baghdad, his parents strapped his broken remains to the roof of a taxi to lead a sorrowful procession to the holy city of Najaf. There, they gave him a ceremonial wash and shrouded him in white cotton before burying him in the shadow of the shrine of Imam Ali, the sainted founder of their...