On June 20, 2006, William Bruce approached his mother as she worked at her desk at home and struck killing blows to her head with a hatchet. Two months earlier, William, a 24-year-old schizophrenic, had been released from Riverview Psychiatric Center in Augusta, Maine, against the recommendations of his doctors. "Very dangerous indeed for release to the community," wrote one in William's record. But the doctor's notes also show that William's release was backed by government-funded patient advocates. According to medical records, the advocates -- none of them physicians -- appear to have fought for his right to refuse treatment,...