Cynically (!), I suggested that it had something to do with oil, proximity to Europe, Qaddafi's history of violence against the West, and the strategic importance of the Arab world. Darfur was just a bunch of desert Arab savages murdering a bunch of hapless desert Blacks, in the middle of nowhere.
I now am chastened by reading this noble humanitarian snippet:
Clinton's former top aide Anne-Marie Slaughter accused the Obama administration of prioritizing oil over the human rights of the people of Libya. "U.S. is defining ‘vital strategic interest' in terms of oil and geography, not universal values. Wrong call that will come back to haunt us," she wrote on Wednesday on her Twitter page.
Ah, that's right. Universal values. How could I forget?