The task of war
One does well to examine the Song of Roland (the French, XIth century, chanson de geste) before jumping to conclusions about war. I particularly recommend Scott Moncrieff’s translation (1919), which had an introduction by G. K. Chesterton that has been anthologized elsewhere. He neither glorifies nor condemns war, and actually, neither did Roland in the “splendidly inconclusive conclusion.” War contains both good and evil characters and events, and is never finished in this world. Any final victory must wait patiently on God. So long as there are insane barbarians (the present regime in Iran offers an unambiguous example) they will have to be fought. It is inappropriate to “make peace” with such a vicious and deceitful enemy. And when there is fighting, there are casualties. The Lord — and Christ is not a milquetoast — does not require us to omit this task, and did not condemn it in His Bible. Those who fight for the right, deserve honour; those who insist on “peace, peace” regardless of occasion are cowards who deserve contempt.
It is sad that there are people, even Catholics, who don’t understand this.