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Cutting off parts of people's penises reduces the chance that said penises will pick up the AIDS virus. As other people have pointed out, let's go that one further, and just cut the troublesome organ off altogether! Breasts are have a tendency to get breast cancer... better have all of them off too, while we're at it.
The 50% solution to AIDS reduction may be circumcision, but the 90+% solution would be condom use. And if you think it's tough to get African truck drivers to use condoms, how easy do you think it's going to be to get them to agree to having the ends of their penises removed?