I think my general question remains. "How could an average outside observer distinguish between another's mental illness and a guy who's just a real out of the box thinker who might be wrong about many ideas but might also add value to the world by perceiving reality in an atypical way?"
PS: I'm not going to say what's true or false about any of Kanye's claims here, but who the hell knows what goes on in the highest levels of Hollywood? This is a circle of people who felt zero shame publicly disparaging critics of Roman Polanski. And apparently the Harvey Weinstein stuff was common knowledge in Hollywood crowds for decades. If you think Kanye has little credibility, well, think about how Hollywood's credibility ought to be perceived.
It seems like consensus is able to make that distinction without too many problems.