To cover up child sexual abuse is to throw out the baby and to save the dirty wash water. Other survivors of other perpetrators whom I have spoken to have had the same fear. Confronting the perpetrator would cause a disruption in the perpetrator's family which they thought might not be warranted if the person was now reformed. The problem with this attitude is that the concern is centered on the wrong person. There is no rational reason to take the risk that a perpetrator is reformed when doing so endangers children.
Former victims have direct knowledge that the perpetrator has done it before.
No one can prove positive that the perpetrator will not do it again. Besides, there is also no way that we can know whether already there are other victims of whom we are unaware, because by its nature the sexual assault of children is a secret act. We do not have the ethical right to protect the perpetrator from the consequences of his or her actions. The perpetrator must be judged based on what they have actually done, not what they may or may not do in the future. It is not cruelty to make a perpetrator pay for the consequences of his or her actions.