gloggawogga
Bluelighter
Are you suggesting that any appreciable amount of them are?
I don't know how many of them are. I do know that every human being is an individual and is worthy of an inquiry before being judged or 'diagnosed' as mentally ill, and and shouldn't be judged or characterized according to stereotypes or pure generalizations.
You also might want to read up on some transpersonal psychiatry:
http://jppr.psychiatryonline.org/cgi/content/full/8/1/12?view=full&pmid=9888104
And specifically look at the parts about differential diagnosis, Wilber pre/trans fallacy etc. etc.