Catechism. Catechism is good for formation and guidance but it is by its very nature in your head concepts and theology. Look up what St Paul says about the law. I believe true non-violence is an outcome of love and springs from the heart and the freedom of knowing you are made in the image and likeness of God. But you did qualify your original response as being simplistic so I understand where you are coming. I am not sure you understand where I am coming from.
God bless