Oddly enough much of the stockpiled WMD that Saddam stashed and WILL someday be found will show to be US made as well since at one time he was considered a friendly.
Personally, and I know it will not be a popular opinion....the problem I have is nerve agents...used on his own people and at one time available for him to use on others. A little white phosphorus between friends and enemies to shed a little light on the fight or motivate hostiles to leave their positions of cover..not so much of a problem personally.
Just my opinion - not about to change it so I don't intent to get involved in a debate on the topic.