@Methuselas
My family in Iran say the Mullahs are too busy running brothels, excuse me, temporary marriage businesses, to be bothered with terrorism. They hire goons to beat up people in the night, but basically are more a local mafia than a global threat.
Also my family's business is usually hit once a week for money from the goons, the mullahs normally don't get their hands dirty. Basically a local mullah showed up with some basiji the first time and gave the "you wouldn't want anything to happen to your shop" speech and then left it to the goons to do the dirty work of collecting the money.