I think a lot of what causes stigma is the lack of a continuum here where its normal to hear voices---there was an article maybe a year ago where the voices were culturally determined, that is they were more likely to be good like you say outside the US/Europe. I think they even mention in this article about how this particular style of thinking can exist outside the US still.

I can think of another book where someone with sz learned shamanism and it really helped them out and in my own life I thought I was selected to be a shaman and learned a modern version of that. Having context for the voices really helps, and seeing some of them as a force for good instead of something to avoid at all costs.