According to Muchiri in 2000, AIDS could lead to human extinction. According to Singer in '02, AIDS could become airborne. If we don't do something now, we will all die.

For those of you that say 'we neeed to deal with our own problems,' the United States can increase its soft power from doing this (Mullan in '05). Soft Power can lead to hard power (Nye '04), and soft power's decline will cause domestic isolationism (Nye). Domestic isolationism leads to great power wars (Thayer in '06). Our image will be promoted all around the world. Issues in Guantanamo, Haditha and Iraq have promoted Anti-americanism, something that can be stopped by helping Africa (Smith in '07)

So, there is something in it for us- to not die from nuclear war. But that isn't the reason we should be debating- MILLIONS are dying.