Saddam invaded Iran. Iran was not out to kill him.
By the time it became widely known he was using gas against Iranian troops he was being supplied by many compainies in the West thanks to Ronnie Raygun. In fact Americans can say "And I helped"
How he US armed Saddam Hussein with chemical weapons | Green Left Weekly
On December 19-20, 1983, Reagan dispatched his Middle East envoy none other than Donald Rumsfeld to Baghdad with a hand-written offer of a resumption of diplomatic relations, which had been severed during the 1967 Arab-Israel war. On March 24, 1984, Rumsfeld was again in Baghdad.
On that same day, the UPI wire service reported from the UN: "Mustard gas laced with a nerve agent has been used on Iranian soldiers ... a team of UN experts has concluded ... Meanwhile, in the Iraqi capital of Baghdad, US presidential envoy Donald Rumsfeld held talks with foreign minister Tariq Aziz."
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According to Washington Post journalist Bob Woodward, in a December 15, 1986 article, the CIA began to secretly supply Iraq with intelligence in 1984 that was used to "calibrate" mustard gas attacks on Iranian troops. Beginning in early 1985, the CIA provided Iraq with "data from sensitive US satellite reconnaissance photography ... to assist Iraqi bombing raids".
But that doesn't mean Libertarians supported either Saddam or Raygun! We didn't.