I like to think of it as society's filter!
with a few exceptions it picks the immoral and base people who are gratuitously polluting the image of God they bear, and slowly removes them from circulation. Like the death penalty, there is an occasional innocent person who dies, but for the most part the system works well and is well worth having. If AIDS did not exist our nation would have spiraled into debauchery much faster than it is now progressing in that direction. If only we could create a disease that only attacks socialists or radical muslims I'd welcome that plague too.
It seems odd to me that the same kooks who want a reduction in human population "for the environment" also sometimes want a cure for AIDS. I would think an eco-nut should love AIDS.
Few exceptions? There are already 12 MILLION orphaned children in Africa whose parents have died of AIDS. By contrast, "only" six million Jews were killed in the Holocaust. "Only" 1.5 million Cambodians were murdered by Pol Pot's regime in the 1970s. "Only" 500,000 people were killed in the Rwandan genocide.
And right now, today there are 12 million orphaned children -- every one of whom counts as one of your "few" exceptions -- in Africa.
Now please, go on. Who is making the "immoral and base" argument?