The creative types are rarely the stable types. Do a search for "Madness + Creativity" sometime and see what you find.
Is there any real data to suggest it must be so? Or do creative types simply use that as a bullsh*t excuse to act as if the rules don't apply to them them? Or . . . do we as a culture in some way expect, and even require, that someone have a dysfunctional lifestyle in order to qualify as a bond fide "creative type".