I think the "you raise the blade" lines can be taken more literally.
It very much makes sense if you look at it at describing a lobotomy. "Locking the door and throwing away the key" also fits, a lobotomy is not only a cruel and unnecessary procedure, but also an irreversible one.
I think it literally describes a lobotomy to act as an example of the treatment of mental illness that you discussed.
I think the "you raise the blade" lines can be taken more literally. It very much makes sense if you look at it at describing a lobotomy. "Locking the door and throwing away the key" also fits, a lobotomy is not only a cruel and unnecessary procedure, but also an irreversible one. I think it literally describes a lobotomy to act as an example of the treatment of mental illness that you discussed.