That is a nonsensical statement. By that "standard", every war launched by Nazi Germany and Soviet Russia were just -- just ask Adolf Hitler or Josef Stalin.
Not non-sensical; the authority and responsibility for actions to ensure the public safety rest with Caesar, not the Church. I certainly do not mean that any war is justifiable, but that the prohibition against abortion is absolute, while the justifiability of the war in Iraq is debatable. I, for one, believe that the president is, in this case, in a better position to make the decision.