I agree, I would only add that it was also a more general ridicule of the teaching system in England at the time. I'm not sure if things have improved but I know that the United States has some similar problems in its public system. From my own personal experience I can recall many kind, loving, role model types but several (one especially) who fits the stereotype set forth in "The Wall" very well.

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We don't know what the hell it is, except that it's very large and it has a purpose.
-Dr. Floyd, 2010