Jamie,
I brought up Nazi Germany, Stalinist Russia, and the Islamic faith as other examples of controversial subjects in modern American society. I suspect that you have no emotional attachment to Nazis or Communists. Thus, it may be easier for you or others to analyze the difference between covering Nazis or the Soviet Union in the classroom and seeing a Nazi flag or a hammer and sickle displayed in a public setting.
This has nothing to do with historically comparing the Confederacy to Nazi Germany, etc. Instead, I am talking about the contextual difference between a controversial subject in the classroom and the image of that subject in public.