Cheating Darwin

So I have been reading the latest edition of Vanity Fair, guest edited by Bono himself, which probably explains the less than stellar quality of some of the articles. It has been really hard to get through. Try as Bono might to celebrate the triumphs of Africa, there just isn't enough there. If Tunisia, a country that has been run by a succession of "benevolent dictators" is being held up as a model of Africa's future, you can't help but be troubled. And then not a single article manged to avoid the discussion of the diseases that have ravaged Africa over the generations.

I remember learning about Darwin and Malthus in high school. If you believe in both survival of the fittest and that population growth rapidly outstrips food production, then I wonder if epidemic disease is a way to shift populations, weed out the weak, and restore the balance between human populations and available resources. You see this often in the animal world, particularly with deer populations. If deer populations rise to an unsupportable level, many deer begin suffering from wasting disease and the population balance is restored within a couple seasons. Perhaps this is what Mother Nature is trying to do? But if it is...

1. Why is it that Africa is bearing the brunt of the burden?
2. What is our moral responsibility to alleviate these epidemics? Can we find a real cure or are we merely postponing an eventual and inevitable population shake out?
3. Are humans really capable of circumventing Darwinian logic?

If it is in fact possible to cheat evolution does that mean the creationists have it? Does it mean that Darwin was wrong? Or is cheating evolution simply mean that it is the fittest that do survive?