Even by Miami-Dade’s reputation for Medicare fraud, the indictment was a shocker: American Therapeutic’s patients could not feed themselves or control their own bodily waste. Many lacked the mental capacity to respond to counseling; instead they simply stared at walls or watched TV. An employee complained that those patients should be ineligible for Medicare since they could not benefit from treatment.She got fired. That launched whistle-blower and criminal investigations that led to the Justice Department’s takedown Thursday of Miami-based American Therapeutic Corp., the nation’s largest chain of mental health clinics.