I think what it boils down to is that Apple shouldn't be deciding if newsworth facts are too obscene to be published. Should news apps be removed if they report on murders?
Given that Apple's de-listing rationale is arbitrary and capricious, restricting one's comments to attempts to predict what Apple might ban provides zero value to any conversation.
Their offensiveness meter seems pretty obvious to me. The only thing I'd really worry about is "apps that duplicate OS features" since you really can't predict that without insider knowledge.