30K to 50K Iranians killed by chemical weapons attacks by US proxy, Iraq. Credible sources estimate 100K killed and 30K-50K is a conservative lowball estimate.

This is an active unhealed wound in Iran. Families of the dead still grieve those killed in cemeteries and graves that are there in almost all their major cities.

Iran has every reason to not like the US which has been destabilising and killing and crippling them economically for several decades.

https://en.wikipedia.org/wiki/Iraqi_chemical_attacks_against...

Iran Air Flight 655 was an international scheduled passenger flight from Tehran to Dubai via Bandar Abbas that was shot down on 3 July 1988 by two surface-to-air missiles fired by USS Vincennes, a United States Navy warship. The missiles hit the Iran Air aircraft, an Airbus A300, while it was flying its usual route over Iran's territorial waters in the Persian Gulf, shortly after the flight departed its stopover location, Bandar Abbas International Airport. All 290 people on board were killed.

No apologies have been forthcoming.