I'm not even sure that Darfur really counts as a Genocide - so much as ot was conflict between tribal groups. In the background of it, were a bunch of exploitable resources, and Great Power competition in the horn of Africa.
If George Clooney is telling you about it - it's safe to assume that it's all about the CIA and GeoStrategy. Has Clooney, or his "human rights expert" wife even whispered about the Genocide in Occupied Palestine? If not - it's because they could care less about Genocide. They're committed to Anglo-American Global (Monopolar) Hegemonic Empire.