This article, linked from Instapundit, is the silliest justification for invading Iraq so far I've seen.There seems to be a fundamental confusion here between liberalism and realism (in the IR sense). A realist doesn't pay attention to the morality of different countries, but to their (converging and diverging) interests. A liberal, on the other hand, pays attention to the morals, but must also (in order to avoid inconsistency) look at the morality of the warfare itself in addition to the morality of the actors that is being used to justify the warfare. Yes, Saddam might be causing poverty and hardship, but the chaos that an invasion would case would create more hardship, and (very likely) a bumper crop of corpses to go along with it before everything settles down.
Construction at the Abu Ghurayb Presidential Palace features extensive and complex water works. U.S. government web site notes that the Iraqi officials claim extensive crop damage due to drought. Photo shows use of scarce water resources to ensure that the lakes of Saddam's palaces are filled and grounds are well tended. CREDIT: U.S. Department of State.
Filling your swimming pool when there's a drought on = justification of overthrow, apparently. The suburbs of the U.S. better watch out.
If one is going to argue morality, then look at it in its totality, not whichever facet you find useful.