A little off topic, but this observation is bang-on: "The smart way to keep people passive and obedient is to strictly limit the spectrum of acceptable opinion, but allow very lively debate within that spectrum." I can think of no end of examples of this. Doug Johnson notes that some others have found a list as well: " Miguel Guhlin and Jennifer LaGarde both list topics they're tired of debating: copyright, education reform via staff development, e-books, social media in education, 21st century skills, etc."
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