This time, the structure that crumbles is the recent report out of MIT to the effect that “diversifying” the faculty is so, so important because — well, because they say so. Here’s the post. There is no evidence that a scientist would accept the proposition that adding a few people from the list of preferred minority groups will actually have a beneficial impact on the quality of teaching at the school, but the diversity mania has nothing to do with evidence and everything to do with feelings and appearances.