Using CW against Iran was not so bad

A cousin of the late Iraqi leader Saddam Hussein has been sentenced to death by an Iraqi court for the mass murder of Kurds in 1988. Ali Hassan al-Majid, known as "Chemical Ali" for using poison gas in the Anfal campaign, was convicted of genocide. Link

db: Killing Kurds with chemical weapons was a crime against humanity. Killing Iranians with chemical weapons was in US eyes not so bad:

When asked [1984] whether the U.S.'s conclusion that Iraq had used chemical weapons [against Iran] would have "any effect on U.S. recent initiatives to expand commercial relationships with Iraq across a broad range, and also a willingness to open diplomatic relations," the department's spokesperson said "No. I'm not aware of any change in our position. We're interested in being involved in a closer dialogue with Iraq" [Document 52].

National Security Archive Electronic Briefing Book No. 82