We Iranians consider ourselves the descendents of the greatest dynasty that ever was.
No matter how much we hate the Islamic regime, the chance of us putting down our guns in front of an invading army is close to absolute zero.
Iraq was a made up country. It didn't exist before WWI. Iran has been here since 500BC when Median and Persian tribes united. Even after Arab invasion, we prevailed and kept our language and culture, even after they cut out the tongue of every Iranian who refused to speak Arabic. They did that for 100 years. Here we are 1600 years later still speaking Persian and even our old religions are making a comeback.