The whole problems lies in that psychiatric is not really a science-based part of medicine, but much akin to psychology. The whole "mind is not the brain," touchy feeling, elaboration, oecus pocus, blabbering dense unproved hypothesis.
Think about: what revolutionary discovery has been herald by psychiatry? None! Do they really understand say schizophrenia better today than in the 1930's? No
Most if not all the progress in the treatment and understanding of "mental disorders" (read disorders of the brain) have been advanced by the neuroscience (brain function analysis by MRI and PET, post mortem molecular and cellular biology, gentics, embryology, cellular and molecular biology of brain and cognition on animal models, neurobiochemstry, neuropharmaco-toxicology, etc, etc, etc.)