Re: Hypothetical: If you could cure Cancer or HIV/AIDS, which would you cure?
Not completely true. You can get HIV/AIDS e.g. from blood transfusions.
If the blood is always tested before transfusion, which it is now, spread of HIV can be prevented. If a HIV positive woman knowingly gets pregnant then she should be arrested imo. If she doesn't know then the pregnancy should be terminated.
Cancer can be genetic. A daughter whose Mother has/had breast cancer will almost always develop cancer.