N. T. Wright Quotes
If you don't have properly constituted civic authorities you will encourage vigilantism and solo efforts at retributive justice - which is anarchy, and God doesn't want his world to be anarchic.
Wright, N. T. Evil and the Justice of God. InterVarsity Press, 2006.
There violence was extreme on both sides. However, the Fascist / Nationalists had a firm policy of violence and terrorism. The institutions of society had so broken down that vigilantism and revenge drove the Republicans to almost the level of atrocities as the Nationalists.
Nicholas Thomas Wright FRSE, known as N. T. Wright or Tom Wright, is an English New Testament scholar, Pauline theologian and Anglican bishop. He was the bishop of Durham from 2003 to 2010. He then became research professor of New Testament and Early Christianity at St Mary's College in the University of St Andrews in Scotland until 2019, when he became a senior research fellow at Wycliffe Hall at the University of Oxford.