Mother was schizophrenic (somewhat mild, 3 clear persons and a few minor players). She was not particularly creative.
Well that is inline with Psychology today - schizophrenics tend not to be more creative - but it can help if you are bipoplar.
"the latest science with large data sets demonstrates a slight tilt towards mental illness among creative people .... It may help to be "a little bit" manic or psychotic, but not enough that you're ill. "
"...researchers in Sweden conducted studies on the general population over a period of 40 years, they found that bipolar disorderâ€”but not schizophrenia, depression, anxiety disorders, alcohol abuse, drug abuse, ASD, ADHD, anorexia nervosa, or completed suicideâ€”was over-represented among people in artistic and scientific occupations. "
From reading the article it sounds like if you are a little "touched" then it is good for your creativity.
Have not seen anything that links horrible to creativity so maybe we are good there might just be enough nice people so we can get our creative stuff from them.