I agree, changing ones media diet is crucial to recovery. I have done so and saw a drastic change in my experience in general, not only with psychotic issues.
The article explains a couple speculations why people in Africa and India have a better time with voices.
First, is because in those cultures, people tend to be less independent and more interdependent, family relations being strong; people depend on each other more and are included. The people in communities are also linked more closely, typically because they together are strugling to survive or are just simply more connected to each other.
Second, there tends to be a richer perspective on spiritual life (ancestors and spirits of variety are either worshiped or recognized as “real”) so the whole cultures attitude is open to the idea of spiritual communication and do not think that it is evil or wrong. There is greater equity and understanding of people that have the experience, not as much stigma as there is in western, more materialistic cultures.
I have read other studies and reports that in general, because of the above positions, people with schizophrenia or psychosis in developing nations, generally have better out comes than those in developed nations.