Thanks Diablo.
The problem is the cancer is not just "the" disease that should scare people. There are 100s of kinds of cancer, but there is really only one AIDS.
AIDS kills far more people than one specific kind of cancer. When we start getting cures for cancer, they'll come one at a time. For example, just because you can cure skin cancer doesn't mean you can do a damn thing about breast cancer. AIDS, though, once cured, will most likely have a common cure.
No, Darth isn't being stupid... I agree with him on that. Teenagers aren't really even the ones spreading AIDS, mostly... Most teenagers do not have AIDs, as if you get it from a parent, you likely get it young. So you would have to have sex with older people who had it to get it.