From the article:
They know that more than 300 million Arabs have fallen to economic stagnation and cultural decline. They know that the standing of Arab states along the measures that matter political freedom, status of women, economic growth is low.
Muslims know their societies can't compete with the West. It drives many of them to rage. Islam is a very political religion and these people are taught they are the best and everyone else is a heathen, yet here they find themselves mired in stagnation and backwardness in virtually every majority Muslim country. It is very hard for them to face their failure.