The real problems started IMHO after the resettlement of Iraqi Republican Guard after Gulf War I. According to my neighbor, it started with a few and then grew as they came in from other parts of the Country.
The Iranians I know here are really nice people and have assimilated into Oklahoma.
Actually I have an Iranian in-law down in Houston. Very civilized, like most of the Iranians who have come to
America to settle. No doubt the Iranian terrorists have inserted a few people here too, but most Iranians still think of themselves as belonging to an older civilization and do not identify with the Arabs.