Further proof, if more were needed, that one should not go to a place called "liberalcatholicnews" to learn what it is that the Catholic Church actually teaches. Anyone who thinks that it is actually against Church teaching to defend the morality of the war in Iraq on just war grounds is, in a word, mistaken.
The status of "just war theory" itself is rather interesting. Just war theory has been a part of Catholic theology only since the medieval period, but of course that does not mean that we ought not to take it seriously--it is quite well established. But the necessary and sufficient conditions for a just war under the classic formulation of ius ad bellum (justifications for going to war) do not, in and of themselves, preclude any and all reformulation. George Weigel, Michael Novak, and others have argued quite convincingly that the war in Iraq has been just from day one. And there is no reason to suppose that just war theory itself cannot be expanded to include the use of military force to prevent or relieve unjust oppression. Indeed, that would appear to be a perfectly good justification for going to war against Nazi Germany.