mw13:
The Torah both B’Ksav and Baal Peh, as well as contemporary poskim say clearly that in situations where there are dangers to life and limb, it’s a chiyuv to protect the victim. This means even if the abuser is the Rosh Hakohol’s son, or the most popular rebbe, it’s a chiyuv to stop his behaviors. The therapist who hears such information has a chiyuv to report it. Apparently Rav Elyashiv is a small fry in your eyes…have a little respect!
Situations of domestic abuse and battery, molestation, etc., the proper authority to deal with the situation is the police. This is a specialized field that rabbanim are untrained for, no matter how many Nefesh lectures they attended.