Of the many theories of AIDS, the only theory that makes sense is contaminated polio vaccine in Africa:

http://www.aidsorigins.com/the-origins-of-the-aids-pandemic/#more-200

The vaccination sites line up almost exactly with the disease breakouts.

Vaccine cultures explains the rapid mutation of the virus.

The closest ancestor to HIV is simian immunodeficiency virus, found in chimpanzees, which were used as substrate.

They admit vaccines can contain unknown viruses, like the similar SV-40 outbreak (another vaccine contaminate that may have led to the explosion of soft tissue cancer).

Polio vaccine was used as an experimental treatment for herpes, specifically in the gay community.