Block out some time and commit it to this epic New Republic piece on Leopold Munyakazi, a Rwandan who came to the United States after his country’s genocide, became a professor at Goucher College and who may or may not have been one of the Hutu genocidaires or an enabler of them. The story involves a dubious approach to television documentary, myriad questions about justice and retribution, the very nature of historical fact, perhaps the most respected observer of Rwandan politics and history, and wrenching questions about what can and cannot be known.