The situation in Darfur is truly a sad situation. I would agree that there is little in the Sudan worth fighting for, and the country poses no threat to the US, or anyone else for that matter.
It is a bit like Rwanda. Who cared that millions died there? In Eritrea and Ethiopia, who really cared that they fought amongst themselves and just about starved to death in the process? And when you do try to help resolve little civil wars, you finish up with situations like "Blackhawk Down". A lot of thanks you get for helping!
We cannot really expect any help from the region which is predominantly Muslim. It is the people from the Christian south of the country who are suffering, and to rectify the situation, neighbours would have to take action against the fellow Muslims.
Thanks to a few natural disasters, like the tsunami, the Pakistani earthquake, Katrina etc, many people are suffering from charity/donor fatigue. It seems to be of late that people have become more inward looking, more involved in their own wellbeing, both as a person and as a nation, than in some dry, tiresome country somewhere in Africa. I think also that we, the international community, have seen so many starving, pot-bellied, fly-ridden African children over the past decade and a half that now we no longer see them. We have switched off. And if we do not see them, we do not care!
Bob Geldhof and Bono try to raise awareness, and they succeed for a second or two, then we switch off again.
Resources that could be used to resolve some of the problems in the Sudan are tied up elsewhere, like in Iraq, Afghanistan, East Timor etc.
As Stalin said, "One death is a tragedy. A million deaths is a statistic." I think we live in a world of statistics, a world where GDP, CPI and IR mean more than deaths in Africa.