Though the topic is not related with macroeconomic development, but with the philosophical belief on economics issues, I thought I would share it with you to know a more polite approach to protest and defend.
A few of Economics 10 of Harvard University walked out from the class of Mankiw to protest the corporatization of higher education as part of Global Occupy movement. They also expressed their exact views on an open letter to Professor Mankiw.
Here is the link of the letter.
So, Professor also answered to the questions and concerns of protesters in his column in New York Times.
Know What You're Protesting.