I didn’t even know who American pianist/composer/author/comedian/actor Oscar Levant was but now feel the need to apologize for paraphrasing him.
Natalie Wolchover of LiveScience asked the same question, “Why Are Genius and Madness Connected?”
Her views: “Many of history’s most celebrated creative geniuses were mentally ill, from renowned artists Vincent van Gogh and Frida Kahlo to literary giants Virginia Woolf and Edgar Allan Poe.
Today, the fabled connection between genius and madness is no longer merely anecdotal. Mounting research shows these two extremes of the human mind really are linked — and scientists are beginning to understand why.”
The rest of her research becomes scientific and goes into explaining details about bipolar disorder. http://www.livescience.com/20713-genius-madness-connected.html
Not exactly the direction where I was heading but one of life’s little mysteries, only less mystifying.