In this chapter, the process leading to the controversial 2003 invasion of Iraq is examined. More specifically, the WMD, which had been cited as the reason for the invasion, is argued to be a genuine belief produced by a self-deceptive process, contrary to the supporters of the straight lie view and of the honest mistake view. The argument develops from the consideration that, granted the gap between the selling reasons and the true reasons of the invasion, the true reasons are hard to tell. Then it proceeds to analyze the effect of 9/11 on the beliefs of the government, and how they were affected by motivated twists in reasoning, causing two self-deceptive beliefs, one of the straight case, that is the equation between terrorists and supporting state, and the other of the twisted case, relative to the conviction that the danger of an imminent possibly nuclear attack was a real probability. The chapter ends by considering the SD of the people concerning the belief in the WMD’s presence in Iraq.