I think the author jumps to some conclusions here - not sure what is cause and effect. Is it possible that people stricken by serious mental illness in these s

I think the author jumps to some conclusions here - not sure what is cause and effect. Is it possible that people stricken by serious mental illness in these societies simply die? I have some experience with mental illness and I can see how someone 'out of their mind' could easily die young when exposed to the elements. I don't have direct evidence, but I believe the mortality rate in rural / isolated societies is higher than in more cultivated societies.