Cardinal Michael Czerny, undersecretary of the Vatican's Migrants and Refugees Section, is pictured in Rome in this Sept. 27, 2019, file photo. At a Nov. 18 event in Rome, Czerny said that Pope Francis' teachings on the "just-war" theory are a crucial point of reflection in today's world where morally justified reasons for aggression and violence are often misused. (CNS/Paul Haring)