Sin equals violence?

“Though working as a theorist and not as theologian or exegete, Girard has put forth a hypothesis about the origin of violence that readily aligns with the biblical evidence. Cain desires what Abel has, namely, the assurance of God’s favor. Denied this favor, he turns his hostility on the model whom he is imitating. The two struggle. Cain kills Abel. A Christian theologian, interpreting this same material, can agree to some extent with Girard on the reason for the violence but concludes that the human predicament is the sins of selfishness and rebellion, one of the consequences of which is violence. The conclusion is inevitable: where sin reigns, violence is inevitable.”—Martens, War in the Bible and Terrorism in the Twenty-First Century, page 42.