If Heaven exists, even if people in Heaven are still the same recognisable individuals they were on Earth, then they will still have been transformed into something much more wonderful:
'Though outwardly we are wasting away, yet inwardly we are being renewed day by day. For our light and momentary troubles are achieving for us an eternal glory that far outweighs them all.' (2Cor 4)
So presumably the murderers, rapists etc - and all of us other sinners! - will have had that evil purged and eradicated by God, so that the original child of God, made in God's image will be restored.
Also, the victims will have been comforted, healed, and restored to their intended glory.
And those who long for the cold justice of revenge will have had the eyes of forgiveness opened by God.
So Heaven won't be full of resentful, hurt souls who feel God has neglected justice, but full of healed souls who are, in the words of the hymn, Ransomed, Healed, Restored, Forgiven.
Please God, let me, and all of those posting here, be received into that Heaven in Your good time.