This is a great question. Why would Catholicism get preferential treatment over any other religion? Aside from that, I don’t see a lot of practical advantage in keeping the secrets or identity of an active serial killer under a seal of any kind. Some people need to be taken off the streets. I wonder how many predators who were members of the clergy were shielded by the seal of confession. Does anyone have any numbers on that? It’s a heavy thing to ponder. We have to temper our religious freedoms with some basic common sense. When you see past the haze of held religious beliefs, hiding a serial killer or serial rapist is simply aiding and abetting a serious crime.
All the best