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Don't discount that the US foisted Saddam Hussein and his chemical weapons on Iran's population. They lost some 20 to 30 thousand civilians to chemical weapons attacks. Yet never once counterattacked with chemical weapons.
The assassinated Khamenei even had a fatwa declaring weapons of mass destruction to be un-Islamic.
No one is innocent in this world, but I can certainly understand why Iran feels the way it does and I find it justified, in the sense had I been born there I probably would feel the same way.
Recall Iran was the only middle-eastern country that supported the UN resolution forming the state of Israel.
US interference left them with a bad taste in their mouth. No wonder they do not like the US and their partners in geopolitical resource grabs.
Citizens of the US and its vassal states are quick to ignore that. Most are too lazy to exercise critical thinking.