There is no better place to look for the Conventional Wisdom, which more often than not is both unwise and wrong, than the editorial pages of the mainstream media, and the editorials there are usually at their most conventional (which is to say, most unwise and most wrong) when they are written by members of the papers’ editorial boards.A good example is this editorial, “M.J. Andersen: A place for affirmative action,” in today’s Providence Journal, just sent to me by a reader. M.J....