What Cameron wanted more than anything was to find a new way to treat mental illness. He instead endorsed "depatterning" or brainwashing as a kind of "cure. Instead, while he admitted to "failure" he never acknowledged the horrors he subjected his victims to.
Dr Cameron's main 'crime' here was not that he didn't tell his patients what he was doing and why, but that what he was doing was intrinsically evil, horrifying, destructive, even sadistic.
Cameron's ultimate crime was betraying his patient's trust. He wanted to go to his grave knowing he'd made a difference. But he became infamous, rather than revered.