In its most disturbing form this comes from zealous Catholics who are on the side of the angels. I'm thinking of Radical Orthodoxy, positivist Catholic ethicists, moral arguers, culture critics, and fans of the ressourcement movement. It's hard to say what's missing. Deep theological formation? Continuity with living tradition? Instinct? Maybe just the basic point that theology draws its principles from the mind of God. (Recently I heard a priest class theological arguments from authority as the very weakest sort of argument -- forgetting what he must have learned in seminary, viz that such arguments are indeed weak, except when, as was the case in this instance, the authority in question is God. THEN the argument from authority is strong indeed, and properly theological.) Oh, well.
Grouse, grouse. Maybe next I'll review this new book, coming out of Ireland, about the ressourcement movement. It's expensive, so I must find a journal that wants a review!