L Ron Hubbard made this claim, long ago. It's part of the Scientology's belief; and has some basis in fact.

Nobody with a Psychiatric disease has ever been "cured", however the use of Psychiatry has been used to drive thousands, if not millions of people, into a psychiatric illness. Hubbard's assertion was that the study of psychiatry does far more harm, than good.

The fact that this is even a debatable topic, gives Mr. Hubbard a sale's pitch into Scientology.