Documentaries are, for the most part, pretty much complete BS. One of the good ones on AIDS is
the "Age of AIDS" by PBS: Frontline.
The amazing effect of HIV anti-retroviral drugs on HIV+ patients basically prove the hypothesis that HIV causes AIDS.
AIDS isn't a disease, it's a medical term for a host of illnesses, plus a low T-cell count that are the result of a long-term HIV infection.