For only the fourth time on French soil, a genocide and crimes against humanity trial opened today in Paris. The previous three all involved notorious Nazis or Nazi collaborators. This one puts in the dock 54-year-old Pascal Simbikangwa, a former head of Rwandan intelligence and one of the alleged orchestrators of a genocide that left nearly 800,000 dead in just 100 days. But what purpose does a trial like this one really serve?