The notion of war being entirely evil, in its own right, without qualifications, is an anachronism. It only dates to about the 18th century. The traditional view of war, as seen by Augustine and Aquinas, would consider the reasons that a war is waged as part of its “justness”. Indeed, Augustine actually looked upon warfare as a way for a man to build virtue. Just war tradition does not regard armed force as inherently suspect morally; rather it treats armed force as an instrument that can be used for good or for evil, depending on who is using it, for what ends, and how. In other words, force itself is a tool that is evil only to the extent it is used indiscriminately, by immoral leaders for immoral ends.
Let’s take one historic example, the Crusades. As Jonathan Riley-Smith has written, it was extremely important to the Crusaders that they have a just
causus belli, in this case, the atrocities committed on Christian pilgrims to the Holy Land. Regardless of what later became of the Crusades, a good case can be made that they at least had a just cause for being waged in the beginning.
The magazine
First Things has had several illuminating articles on this topic. I link to just one, an exchange between Rowan Williams, Anglican Archbishop of Canterbury and George Weigel - papal biographer to John Paul II:
firstthings.com/ftissues/ft0403/articles/williamsweigel.html
I like this quote from the Weigel side of the debate (emphasis mine):
…the just war tradition is not a free-floating casuistry of means tests; that just war thinking must function within a normative understanding of the political task; that, in this very specific sense, “war” is a moral category—it is the use of proportionate and discriminate armed force for public ends by
publicly accountable public authorities who have a moral obligation to defend those for whom they have assumed responsibility;
and that “war” (bellum) must be rigorously distinguished from brigandage, piracy, terrorism, and other forms of
duellum, the use of armed force by private persons for private ends.
Note that the car-bombing decapitators running amok in Iraq fit no part of this definition. Whatever you think of the US case for war, the terrorist adversaries in Iraq are waging an unjust war, by unjust means for unjust ends.
If you feel morally compelled to refuse military service, that is for your own conscience. I won’t argue with you, except to say that Catholic moral tradition doesn’t compel one to reach the same conclusion. Thankfully, we have an all-volunteer army. One could argue that you need to consider that if you don’t help defend your country, someone else has to. To quote one writer : “*Good people sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf.” *