I think it all depends - unrepentant hearts are not ready for forgiveness and need due punishment for actions for everyones good, especially for the good of the perpetrator(s).
Given the reason this tragedy occurred, the source of it will never be resolved in this life - only at the end of all things.
Guess I am trying to say that yes forgiveness is good, but acting like it did not occur for the reasons it did, and appearing or being weak in order to be politically correct, instead of being wise - just not a good thing.