Edit: I wrote the original post in a fit of pique, and I regret it.
We would have felt differently about him if he had published a book titled "iCancer: How I Beat The Disease Using Alternative Medicine".
(FWIW if Jobs had devoted an inordinate amount of time to encouraging his audience to follow quack cancer cures it would be a stain on his reputation but wouldn't diminish the value of his separate contributions to UX or consumer electronics)