Interesting article from the British center-left magazine, Prospect:

The question of what to do in Iraq today must be separated from the decision to topple Saddam Hussein four and a half years ago. That decision is a matter for historians. By any normal ethical standard, the coalition's current project in Iraq is a just one. Britain, America and Iraq's other allies are there as the guests of an elected government given a huge mandate by Iraqi voters under a legitimate constitution. The UN approved the coalition's role in May 2003, and the mandate has been renewed annually since then, most recently this August. Meanwhile, the other side in this war are among the worst people in global politics: Baathists, the Nazis of the middle east; Sunni fundamentalists, the chief opponents of progress in Islam's struggle with modernity; and the government of Iran. Ethically, causes do not come much clearer than this one.

Some just wars, however, are not worth fighting. There are countries that do not matter very much to the rest of the world. Rwanda is one tragic example; and its case illustrates the immorality of a completely pragmatic foreign policy. But Iraq, the world's axial country since the beginning of history and all the more important in the current era for probably possessing the world's largest reserves of oil, is no Rwanda. Nor do two or three improvised explosive devices a day, for all the personal tragedy involved in each casualty, make a Vietnam.

The great question in deciding whether to keep fighting in Iraq is not about the morality and self-interest of supporting a struggling democracy that is also one of the most important countries in the world. The question is whether the war is winnable and whether we can help the winning of it. The answer is made much easier by the fact that three and a half years after the start of the insurgency, most of the big questions in Iraq have been resolved. Moreover, they have been resolved in ways that are mostly towards the positive end of the range of outcomes imagined at the start of the project. The country is whole. It has embraced the ballot box. It has created a fair and popular constitution. It has avoided all-out civil war. It has not been taken over by Iran. It has put an end to Kurdish and marsh Arab genocide, and anti-Shia apartheid. It has rejected mass revenge against the Sunnis. As shown in the great national votes of 2005 and the noisy celebrations of the Iraq football team's success in July, Iraq survived the Saddam Hussein era with a sense of national unity; even the Kurds—whose reluctant commitment to autonomy rather than full independence is in no danger of changing—celebrated. Iraq's condition has not caused a sectarian apocalypse across the region. The country has ceased to be a threat to the world or its region. The only neighbours threatened by its status today are the leaders in Damascus, Riyadh and Tehran.

The whole article is worth reading.