We must remember that all of these diseases are much higher now than they were in the past, 100, even 50 years ago. A lot of factors, I'm sure, but let's look at the things we are using, and using more of, compared to that time.
Regarding AIDS, perhaps the African AIDS has a more predominant root than in the west. Also, perhaps it is not bleach itself being used but the sub-ingredients find their way into their environment, be it in the rain, in things they find or buy. Also, who's to say where this bleach stuff is being made?