Who can forget Halabja? The true question is: Who can remember the West's role in Halabja? Dilip Hiro fills in some of the missing details about what actually happened, and about the 'us' of Shawcross' title, "Let's take him out":

"To retake Halabja from Iran and its Kurdish allies, who had captured it in March, Iraq's air force attacked it with poison gas bombs. The objective was to take out the occupying Iranian troops (who had by then left the town); instead, the assault killed 3,200 to 5,000 civilians. The images of men, woman and children, frozen in instant death, relayed by the Iranian media, shocked the world. Yet no condemnation came from Washington... [I}nstead of pressuring him [Saddam] to reverse his stand, or face a ban on the sale of American military equipment and advanced technology to Iraq by the revival of the Senate's bill, US Secretary of State George Shultz chose to say only that interviews with the Kurdish refugees in Turkey and 'other sources' (which remained obscure) pointed towards Iraqi use of chemical agents. These two elements did not constitute 'conclusive' evidence. This was the verdict of Shultz's British counterpart, Sir Geoffrey Howe: 'If conclusive evidence is obtained, then punitive measures against Iraq have not been ruled out.' As neither he nor Shultz is known to have made a further move to get at the truth, Iraq went unpunished." ('When US turned a blind eye to poison gas', The Observer, 1 September, 2002)
http://www.observer.co.uk/focus/story/0,6903,784125,00.html