I'd assume they don't like getting shot. A lot of Iranians have left the country especially in the past three years.

I recently met a Jewish Iranian couple, who left Iran 10 days after their wedding, because the Iranian government confiscated their property claiming they are funding the Israeli government. They told me their neighbourhood has mostly been emptied of it's previous upper class (Muslim and Jewish) occupants in the past three years due to the baseless polemics.

It sounds like the government is doing some population shuffling to protect it's control.