Posing a clear and present danger to the security of the United States. If "mass murder and raping children", of which the Saddam Hussein regime appears to be guilty, constituted causus belli, we would have the right and duty to wage war against numerous regimes throughout the world, from small nations in Africa to the People's Republic of China. Do we, who tolerate the mass murder of children in our own country, have such a right and duty? I think we have matters to attend here, first.
I disagree with the Bishop, however. Our reasons for waging war against Saddam Hussein et al. have to do with protecting our own safety. Putting a stop to Saddam's unspeakable brutality is bonus.
So do I.
I'm not sure canon law allows him to declare this a mortal sin. Are there any canon lawyers around?
In any event, there are some bishops, not too few who are from the liberal sector, who are overly vocal and imprudent with their statements (they appear more anti-American than anything else). Archbishop Renato Martino for one.