Some thoughts from N.T. Wright:
"But justice without forgiveness is revenge. And forgiveness without justice is appeasement."
"The point of following Jesus isn’t simply so that we can be sure of going to a better place than this after we die. Our future beyond death is enormously important, but the nature of the Christian hope is such that it plays back into the present life. We’re called, here and now, to be instruments of God’s new creation, the world-put-to-rights, which has already been launched in Jesus and of which Jesus’ followers are supposed to be not simply beneficiaries but also agents."
"Two examples here. The first is Desmond Tutu and his work on the Commission on Truth and Reconciliation. I have no hesitation in saying that the fact of such a body even existing, let alone doing the work it has done, is the most extraordinary sign of the power of the Christian gospel in the world in my lifetime. We only have to think for a moment of how unthinkable such a thing would have been 25 years ago, or indeed how unthinkable such a thing would still be in Beirut, Belfast or—God help us—Jerusalem to see that something truly remarkable has taken place for which we should thank God in fear and trembling.
The second example is the killing of the Amish school children. The families of the girls who were killed extended forgiveness to the man and comforted the family. Also, these families insisted that some of the money raised by the Mennonites to support them be given to support the family of the shooter, who killed himself. These countercultural examples show how the Christian community can react. "