We all assume that the HIV-causes-AIDS theory has been proven beyond reasonable doubt, since otherwise, why would we be seeing so much material that takes it for granted, right?

Well... It turns out the HIV/AIDS theory might not have been proven, ever. At all. It might be, in fact, that it is only the result of mass hysteria and a long game of "telephone".

Or, as it says on the website of one Peter Duesberg:
On the basis of his experience with retroviruses, Duesberg has challenged the virus-AIDS hypothesis in the pages of such journals as Cancer Research, Lancet, Proceedings of the National Academy of Sciences, Science, Nature, Journal of AIDS, AIDS Forschung, Biomedicine and Pharmacotherapeutics, New England Journal of Medicine and Research in Immunology. He has instead proposed the hypothesis that the various American/European AIDS diseases are brought on by the long-term consumption of recreational drugs and/or AZT itself, which is prescribed to prevent or treat AIDS. See The AIDS Dilemma: Drug diseases blamed on a passenger virus.
I very much recommend checking out this site. It discusses this topic surprisingly professionally.

Did you know that at least one of the researchers credited with discovering HIV has since stated, according to Alive and Well, that "he does not believe HIV alone is capable of causing AIDS"?

See also my next post where I link to sites in favor of the opposite point of view.