Why??

http://www.newsweek.com/id/117875?GT1=43001

After taking a look at the janjaweed militia, it may seem hard to understand who these people really are, and why they are doing what they're doing. It's scary to think of their reach and power. Why is the international community doing so little to stop a group that is committing genocide not only against the natural habitat, but also against their neighbors? Better yet, IS it our responsibility to help? Why or why not?