Like other exponents of Islamist extremism, he has a view of the world that does not tolerate doubt or ambiguity: his opponents are guilty, and must be killed. I have met other radicals like Mr. Saeed, men who live in a dimension of absolute certainty and have contempt for the moral relativism of those who seek to excuse them. To achieve their ends, it is necessary to indoctrinate boys in the hatred of Hindus, Americans and Jews, and dispatch them on suicide missions. It is unlikely that any of the militants who were sent from Karachi to Mumbai — young men from poor rural backgrounds whose families were paid for their sacrifice — had ever met a Jew before they tortured and killed Rabbi Gavriel Holtzberg and his wife, Rivka, who was several months pregnant, at the Mumbai Jewish center.