The problem with this argument is that for the public health system of a random country X that happens to be not located in Africa, the spread patterns in Afric

The problem with this argument is that for the public health system of a random country X that happens to be not located in Africa, the spread patterns in Africa matter very little. If you're trying to prevent the spread of a certain disease in country X, you're looking at the known spread pattern in X. And the same goes for HIV.