My belief parallels those asserted in the video. AIDS appeared just at the time that homosexual rights became a political hot potato; infections first appeared only in homosexual populations (San Francisco, Atlanta, New York).
My suspicion was/is that medication(s) were tainted with the AIDS virus and shipped into the free clinics where unsuspecting and trusted healthcare professionals became the delivery system.
I believed it likely to be a government bio weapon because of the speed and finality of what it did. The government quickly responded to the bio weapon suspicions and accusations with finger pointing to other possibilities.
At one time the government cast suspicion upon the Haitian boat-people. When the Haitian community made it clear they were not having it, government finger pointing shifted to a male Canadian flight attendant who, while in Africa, allegedly engaged sexually with an African man who had been bitten by a monkey (of course, the flight attendant was unavailable for comment at the time due to his demise). This claim for AIDS transmission was later dispelled.