George Monbiot argues that the United States is behaving like a hypocrite. He says of the US using tear gas inside Iraq:
The deployment of chemicals in Baghdad could be the event which finally destroys the treaties designed to contain them, and this, in turn, would be another step towards the demolition of international law and the inception of a bloody and brutal era, in which might is unconstrained by universal notions of right.
You cannot use chemical weapons to wage war against chemical weapons. They are, as the convention makes clear, the instruments of terrorists. By deploying them, the US government would liquidate one of the remaining moral distinctions between its own behaviour and that of the man it asks us to abominate.