The tumult indelibly dubbed “the Arab Spring” in the West, by the credulous and the calculating alike, is easier to understand once you grasp two basics. First, the most important fact in the Arab world — as well as in Iran, Turkey, Pakistan, Afghanistan, and other neighboring non-Arab territories — is Islam. It is not poverty, illiteracy, or the lack of modern democratic institutions. These, like anti-Semitism, anti-Americanism, and an insular propensity to buy into conspiracy theories featuring infidel villains, are effects of Islam’s regional hegemony and supremacist tendency, not causes of it. One need not be led to that …