Your last sentence says it all and sums up both your attitude and ignorance .

It would be pertinent if you read your own research first.
"However, urban settings have shown to yield exceptionally high HIV prevalences among female sex workers, as high as 20% in Bangkok, for example."

I suppose next you will say " if a plane was going to crash 20% of the time you would get on it "when I considered it safe enough to do so!"