This whole cartoon business is about intolerance. Muslim intolerance of those that disagree with them. CAIR is a leftist group that's trying to recruit Muslims into a left-wing political movement that portrays Muslims as the latest oppressed "minority."
It's also about islam's fear of being exposed for the fraud that it is. Muslims seem to instinctively fear critical examination of islam.
It's a pretty tough day when you discover your great prophet was a fake.