Guilbert, let me try to simplify this as much as humanly possible specifically for you.  What do Mao's Revolutionary Gaurd, the Brownshirts of Germany and the masked "demonstrators" rioting on America's College campuses have in common?
Is it a political philosophy?  Hint (No). 
Answer: It is their complete intolerance and violent response to those they identify as opponents. Simple, isn't it.   
Your post is a total overgeneralization and it completely misses the point.