It may help if people see that forgiveness is a moral virtue, as are justice, patience, courage, and love. We exercise justice in families and groups all the time. You can ask, “Why, then, can’t we make room for this other moral virtue, forgiveness?” It would be helpful if you then are attuned to the others’ misconceptions about what, exactly, constitutes this moral virtue of forgiveness: Do they see forgiving as excusing or ignoring justice? Clearing up misconceptions usually makes forgiveness more acceptable.
For additional information, see Forgiveness Defined.