Iran has been on the receiving end of those weapons of mass destruction. They have lost 30 to 50 thousand people to those US bankrolled chemical weapons attacks and its still an openly grieved unhealed wound in Iranian society.

Most cities have graves, cemeteries, memorials were families still grieve and remember their dead.

Notably, Iran never retaliated with chemical weapons. Could have a common root cause that later led to a fatwa against developing nukes.

I am surprised that the lay American gets so surprised that they do not like the American administration so much.

Add to that the fact that US upended their parliamentary democracy with a sponsored coup, that the US shot down one of their domestic passenger jets in flight with no apologies forthcoming.