Healing forgivness

Why don't people forgive? Living in the Bible Belt, many would think forgiveness would come as second nature, but when they hear of "a con artist (swindling) elderly people out of their life savings," the instant response is a negative, derogatory statement. As humans we will all make  mistakes, some more afflicting than others, so, as Christians, we must all remember that before concluding a judgement on one's behavior.