Rufina Amaya, the woman who was often identified as the last, or only, survivor of the massacre at the village of El Mozote, died last week. She was not, strictly speaking, the only survivor of that monstrous event, but she appears to have been the only one who emerged with her wits about her, a clear memory of what took place, and the will to describe how hundreds of people, including her husband and four of her children, were systematically butchered on Dec. 11, 1981, in an impoverished corner of El Salvador...