The incredible part about that detail would be that in any other animal much of Schizophrenia's symptoms would be subclinical, in that language and socialization expresses most of Schizophrenia's detriments.

The paper is really about emergence and transmission of the disorder, and not so much about why humans find faults in those afflicted by it. But consider solitary animals, or apex predators. That they'd be schizophrenic, and construct distorted understandings of the world around them probably wouldn't matter, as long as they manage to hunt for food and produce offspring. No one would care about what a bear thinks of the origin of the universe, or how realistic its outlook of its own future is.

I realize that Schizophrenia has other debilitating effects, but it also affects people in varying degrees.