I'm 100% against plagiarism, and 100% for citing sources. That said, I don't feel that a citation is needed at the end of a sentence if the writer says "Nietzsche says" at the beginning of a paraphrased thought. This seems redundant to me, as the credit has been properly given within the text and thus any plagiarism s/b mitigated. Or, am I misunderstanding something? (This would especially hold true in your example, which I personally didn't find "leans too much" on the source. But, admittedly, the idea that a thought can indeed lean "too much" implies that there's a judgment call in there -- which I do agree with.) Interesting article! :-)