Augustine, thought war could be justified in certain circumstances, one of which was if the following peace created more good than the evil if the war wasn’t fought.

And don’t forget Aquinas, who literally sandwiched his one chapter on war between the chapters detailing mercy. If I remember the professors correctly, that was no mistake, and was very, very thematically intentional. Christians are downright fucked in the head as they try to cognitive dissonance their way into reconciling our species’ lust for war with high minded ideals of love and kindness.