As the torrent of refugees flowed past the little Rwandan village of Nkuli last week, Jonasi Ruziga stood in silence and stared. The numbers were overwhelming--more than half a million Hutu, alternately trudging through the pouring rain and panting under the tropical sun. Ruziga, a Tutsi trader, had an equally overwhelming reason for monitoring their passage. He was looking for the murderers of his children. "Yesterday evening I saw two of them," he said. "They passed here along this road. Then this morning I saw one more walking by. Just like that."
The epic influx of refugees was made up mostly...