Down through the years scientists have supported racism and still do. I recommend reading from the following site:
Allow me to copy some of what that site contends:
Western scientists have promoted the hypothesis that the AIDS epidemic began in Africa, arguing that either AIDS had existed for many years in an African "lost tribe" or that a retrovirus crossed the species barrier from monkey to man. The scientific evidence in support of this hypothesis has included AIDS-like cases from Africa that predated the epidemic in the West, seroepidemiological evidence for early African infection, and the isolation of retroviruses from African monkeys considered similar to the human immunodeficiency virus. Yet when the scientific literature supporting an African origin is examined it is found to be contradictory, insubstantial or unsound, whilst the possibility that AIDS was introduced to Africa from the West has not been seriously investigated. The belief that the AIDS epidemic originated in Africa has also distorted Western perceptions of the scale and mode of spread of the epidemic in Africa, and it would seem that much of the research into AIDS and Africa has been influenced by racism and not science.
The Acquired Immune Deficiency Syndrome (AIDS) was first recognised as a clinical entity in 1981 in the United States,(1) and although the majority of cases even today have been reported from the United States,(2) the Western scientific community has convinced the world that it is primarily an African disease and an African problem. To explain how a disease originating in one continent was yet disseminated to the rest of the world from another, the scientists have argued that there was a remote central African "lost tribe" in whom the virus had been present for centuries,(3) or alternatively who acquired the infection from monkeys 30 or so years ago.(4) Haitians (but no-one else) working in central Africa then became infected (presumably heterosexually) and, on returning home, spread the disease to homosexual American tourists.(5,6,pp.17-20) By this circuitous route the virus reached the United States and from there spread to the rest of the world.
Because we suspected a racist motivation for the "science" that was arguing for AIDS from Africa we decided to review the scientific literature, eventually publishing our work in a book(7). When questioning the African hypothesis we anticipated a difficult task, as the research was conducted by reputable scientists and was subjected to peer review prior to publication. As our study progressed it became increasingly clear to us that the racist preconceptions of the researchers led them to conclusions that had no scientific foundation.