Maybe this could explain why mental illness & creativity seem to be so closely related? Just as one example, James Joyce's daughter was schizophrenic.
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According to Wikipedia, creative people are 25% more likely to have a mental illness.
As for why so many bipolar people are famous, manic episodes can be very productive.
For myself, being bipolar has given me several lifetimes of perspective to inform my writing.
https://en.m.wikipedia.org/wiki/Creativity_and_mental_health
What do you think a correlation is if not a relationship? No one said it was "required".
There’s absolutely a correlation, enough to be causation. But it doesn’t make mental illness a primary factor in creativity in modern society.