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Pink Floyd – Brain Damage Lyrics 6 years ago
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.

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