Forgiveness is not sentimentality. Forgiveness demands justice. In order to forgive, both parties need to acknowledge the wrong that has been done, and the offending party must show some repentance, some desire to right the wrongs, to address the harm that has been done and to make amends.
When someone has been hurt, violated, abused, they are exercising the willingness to forgive when they make the attempts to re-enter relationships. If a woman has been raped, for example, she is exercising a form of forgiveness, within her own psyche, to men in general, when she is ready and willing to open herself up to a new relationship. If a person has experienced spiritual abuse by a group or person, s/he is exercising a degree of forgiveness to those who betrayed her trust when she is willing to enter a new relationship with another group or person on a spritual or ethical basis.
However, full forgiveness towards the abuser cannot happen until the evil that was done has been acknowledged and dealt with. Forgivenes does not mean ignoring the past or moving prematurely to attempted reconciliation with the abusers. Only when those on the other side of the equation, the ones who did the wrong, are ready to admit their wrong-doing and to make amends does the possibility of full forgiveness enter the arena.
In the absence of repentacne on the part of the perpetrator, forgiveness is morally objectionable because it involves an abandonment of justice.
Forgiveness also does not mean that you necessarily re-enter a relationship with the perpetrator, even if they do repent of their wrong-doing. It will free both parties into new relationsips, but does not require re-committment to the old one.