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Wikipedia already requires verifiability (WP:V and WP:OR) and a neutral point of view (WP:NPOV), but it seems that in order to lay a claim to objectivity, Wikipedia must also require source citations to be treated differently according as whether the substance of the text is indifferent (i.e. cannot spark an argument among the majority of readers) or tendentious. It is not fair to readers to cite tendentious texts indirectly--that is, by paraphrasing or summarizing the content, because that is the way in which certain authors with personal agendas try to influence the content of an article.
As such, any text which takes a side on a difficult or controversial question--especially in cases where the text represents an extreme viewpoint--should be cited directly.