What about Apple's rights?
I don't think he should have been unable to publish this, and he wasn't. But surely Apple has the right not to sell material which they deem inappropriate?
If this were a story of a shopkeeper being forced to sell material he considered offensive to his faith, for example, who would you condemn?
Yes, I don't use Apple products (beyond iTunes to store/organize/play my music), both because of the price point and the lack of openness, but that lack of openness is Apple's choice, just as I have the choice not to give them my business. But people who do choose to buy Apple devices should not then complain about the fact that they're limited to Apple-approved apps and content in Apple's stores. And it's not like one can't just download Kindle for iOS and buy the book there.