There's a huge difference between a news app that happens to cover murders and a "murder news" app that only covers that specific subset. The app in question is clearly much closer to the latter.
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.