I've been following the man's antics with amazement. He's obviously a very disturbed individual. I've heard privately from people who worked in national security in the Bush Administration that he had a fascination with torture and would keep after it even when begged by his associates to give it a rest. Obviously it serves deep psychological needs for him. His daughter is right - torture truly is his cause, in the same sense that global warming is Al Gore's.
Of course, I don't wish to discount Cheney's rational motive, from his perspective, to fabricate evidence in support of invading Iraq.