CONCHO: One word for you: Halabja. Saddam’s WMD program was not only of concern to the US, but the French, British and Russians as well.
Saddam used chem weapons against the Kurds at Halabja, and had used them against the Iranians in the Iran-Iraq War.
Iran’s intents, like Hitler’s, have been clearly and explicitly stated. The hardliner government has made it abundantly clear that they are willing to accept massive casualties in exchange for the destruction of Israel and the US (“The Great Satan”).