Correction, Germany did more than anyone to help Iraq with chemical weapons. 52% of their chemical weapons equipment derived from Germany for example. The Germans knew exactly what they were doing.
I'd call it a team effort. The US was certainly selling dual use equipment in the war, and not only did it not lift a finger to stop the use of chemical weapons, it blocked the UN Security Council from even passing a resolution saying that using them was a bad thing.
America also provided rhetorical cover for Iraq by accusing Iran of using chemical weapons as well. Allegations which were never substantiated, probably because it never actually happened.
And when the Reagan administration learned that Iraq was targetting their own Kurdish population with chemical weapons, they still didn't give a shit. But two decades later, when Bush the Younger decided to emulate his father, the American government invoked those gas attacks against civilians as a justification to dismantle Iraq. Two decades late for the Kurds that got gassed by Iraq while the American government pretended not to notice. American foreign policy is depraved.
Civilians, not only soldiers, were gassed by the German's munitions resulting in long term injuries and deaths. It's surprising this isn't more well known, and that Germany was not internationally censured, tried, & made to pay compensation to the victims of these disgusting actions following their conduct in the Holocaust.
Why's it so necessary for Germany to sell chemical weapons to be used in a warzone anyway? I wouldn't be surprised to see these were the same companies or individuals that acted 40 years earlier.
https://en.wikipedia.org/wiki/Iraqi_chemical_weapons_program