In the past there were many horrors that passed as treatment. And the lobotomies, trepanning (holes in the head) and accusations of witchcraft were all associated with mental illness at one time or another.
Our knowledge of mental illness has vastly changed and, hopefully, our practice of treatment has changed. The above mentioned historical treatments make us shudder; but, I wonder which of today's treatments will make people shudder in 100 years?