What would you consider "real harm"? The argument I just made has nothing to do with self-image or appearance. Saying that the foreskin has a very real purpose doesn't mean there aren't instances where it needs to be removed, but that doesn't excuse the way it is practiced on non-consenting infants with no medical justification.
By the way, as with most controversial medical findings, multiple studies have yielded widely varying results on the subject of circumcision and AIDS. The study where you may have gotten this idea was a longitudinal study, reported in the Wall Street Journal, of 3,000 young South African men, half of whom were circumcised; after a year, the circumcised group had 30% the rate of HIV infection that the uncircumcised group did. Incidentally, this study has yet to be published in any peer-reviewed journal. It failed to document other contributing factors to the men's risk of infection and ensure their status as a representative sample, such as other STD's they might carry, socio-economic status, and their sexual practices such as the regionally popular "dry sex" (drying the vagina by douching it and absorbing the vaginal fluid, which dramatically increases the risk of transmission) and the status of the female as circumcised or not (again, circumcised females appear to be far more likely to transmit AIDS and other STDs, but the exact effect of female circumcision cannot be known because not a single study has ever been published on the subject, in comparison the more than 40 studies on AIDS and male circumcision.) Several similar studies on the same subject have also been subjected to heavy peer criticism of their methodology (among them accusations of trumping up an easy solution out of desperation), and many have, again, never been published in any medical journal.
Another common basis for arguing for circumcision as a solution to AIDS in Africa, first noted in the 1980's, is that African cultures that do not practice circumcision generally have a higher occurence of AIDS than those that do circumcise; however, this fails once again to take into account other sexual practices that differ culturally alongside traditional circumcision practices. It's also important to note that although, among the industrialized countries, the United States has far and away the highest rate of circumcision, it also has the highest rate of AIDS infection.
There is also much data to indicate that male circumcision actually increases the risk of both male to female and female to male transmissions. The prepuce in both males and females secretes in its mucosa the enzyme lysozyme, which breaks down the cell walls of bacteria that can otherwise form lesions on the genitals that increase the risk of infection. There is in fact some evidence that lysozyme may even help destroy HIV directly. In addition, circumcised men are at higher risk for infection with gonorrhea, syphillis, and genital warts, all of which can also cause lesions that, again, increase susceptibility to AIDS transmission (the risk of other lesion-causing STDs, HPV and herpes, is equal regardless of circumcision). In the US, circumcised men have been proven more likely to engage in risky sexual practices such as unprotected sex, sex with multiple partners, and anal penetration; it's possible that they see their circumcision as a license to engage in risky behaviour because they believe it offers protection; it's also possible that the psychological effects of the circumcision cause them to want to experiment with unconventional practices: either way, there is a risk of more irresponsible sexual behaviour in regions where circumcision is introduced as a protective measure, especially if it is seen as a replacement for the healthy, sanitary conduct that has been stressed previously by medical workers.
Finally, a large number of studies show either a direct corellation between male circumcision and AIDS infection, or no corellation at all. In a Johns Hopkins University study of 5690 women in Rwanda, several risk factors were identified, including having a circumsized partner, as well as more expected factors like a history of prostitution, multiple partners, socioeconomic status, smoking, and a history of other STD's. Of two studies in the journal AIDS that each selected a random sampling of adults age 15-54 from representative areas of rural and urban Tanzania, one found no evidence of any correlation between circumcision status and HIV prevalence; the other again listed male circumcision along with other factors as adding to the risk of infection. A retrospective study of patients at an HIV care clinic, which took into account their marital status, class, religion and other factors, showed no difference in the rate of infection among couples where the male was circumcised and where he was not. And a study of infected U.S. Navy personnel found no signifcant difference between the rate of infection in those circumcised (84.9%) and those uncircumcised (81.8%), although among risk groups defined by other factors such as marital status, sex with multiple partners, condom use, and history of other STD's, the rate was exponentially higher.
All in all, there is simply not enough conlusive data to recommend circumcision as a preventative measure against AIDS; there is a very real risk that beginning large-scale circumcisions could at worst increase the rate of transmission, or, even if merely ineffective, cost billions of dollars in funding that could have been used for education about safe sexual practices, or for remedying Africa's economic situation that leaves so many people with nothing to do but ****, and no way to make money but to get ****ed. This is substantiated by USAID's support of research on the subject of circumcision, but refusal so far to give funding to AIDS prevention programs that actually circumcise or encourage circumcision.