Shock Treatments = Invisibility?

On page 67 when Harding is explaining Electro Shock Therapy, he makes an example of the Chief's experience. Harding says, "The Chief recieved more than two hundred shock treatments... There's your Vanishing American, a six-foot-eight sweeping machine, scared of its own shadow. That, my friend, is what we can be threatened with." This made me wonder: maybe Nurse Ratched uses methods such as Electro Shock Therapy to make the patients more invisible than they already are. Maybe the institution as a whole is to keep the the patients and their problems "invisible" to the outside world. By forcing the men to endure this kind of traumatic treatment, Nurse Ratched is asserting her power and making the patients feel inferior. It's almost as if their confidence has gone into hiding, which also relates to Harding's rabbit theory. "The rabbit becomes frightened and hides when the wolf is about," (62). The wolf represents the Nurse, and her methods of "treatment" for the patients scare them in to keeping quiet and submissive, almost completely invisible.