Understanding the one who offended is very different from excusing the person’s behavior. We can accept a person as having unconditional worth and then hold fast to the truth that the behavior was wrong, is wrong, and always will be wrong despite my understanding the person as a person. In other words, it is important to separate the person and the unjust actions. We try to welcome the person back into the human community as we forgive; we do not then accept the behavior.
For additional information, see Forgiveness Defined.