I'm persian myself. Those non jewish persians who fled iran and were very pro shah are relatively more descent people. But all on all I would not be comfortable trusting any of them. Guilty until proven innocent. Of those persians I speak of there could some righteous ones.
Non persians of old can almost be known as a natural enemy to islam. However very few or any exist. The current govt was brought about the majority of iranians. So basically my over all impression is not to trust a non jewish one. Guilty until proven innocent