I do not follow conspiracies to a great degree. If "the powers that be" are so concerned about world population, then they would drop anthrax on the middle east wouldn't they?
However, unlike cancer, AIDS is not exactly a problem to western civilisations as it is easily avoided. I do believe that the major pharmeceutical companies are working individually to fight a cure or immunisation to AIDS. Those who will finally develope one will be the greatest company in the world. Therefore, they are not sharing information and perhaps at the same stage on their research. If they pulled resources, then perhaps a cure will be nearer in the making.
I also accept a conspiracy for the common cold. They are not exactly that bad in the great scheme of things but how much does do companies make each time one has a cold??
Vit C tablets
Tissues
Lemsip
Aspirin
Lockets
Tunes etc etc etc etc etc etc etc etc.
Would it really be cost effective to obliterate the common cold? The amount companies would lose if treatments were not needed would push the price of a cure for the common cold to probably �1000+. No health service could afford this.