I’m cutting this post by 56 percent over previous ones on the same subject. New CEP report out today (pdf) will set this off again. Rather than revisit, this post and this one lay out some of the issues and links to other points of view. Short take: It happens and it’s counterproductive and mostly unnecessary. Only new thing I’ve seen on this lately is E.D. Hirsch in the WaPo and Karin Chenoweth’s comments. Update: Hoff has more and asks the right question.