Iran of course is Shiite, while the bulk of the Arabs are Sunni, that is a problem or could be a problem. Also, there is the simple fact that Iran is non-Arab and most of the Muslims in the Middle East are Arab.
Samuel P. HuntingtonSome Westerners […] have argued that the West does not have problems with Islam but only with violent Islamist extremists. Fourteen hundred years of history demonstrate otherwise.
Samuel P. HuntingtonThe biggest difference as far as Muslims in Europe and America are concerned is that the number of Muslims in America is small compared to the number in Europe.
Samuel P. HuntingtonAs far as ideology or political beliefs are concerned, countries are very different.
Samuel P. Huntington