Some people are too deep in this case. Like, worryingly deep. They can't see the harm they are doing.

The goal is to find the murderer(s), not to entertain a freaking media circus. They have to protect the investigation. And they have to protect everyone in this case from the creeps who think they are investigating and end up harassing literally any person who was remotely linked to someone who knew one of the victims' sister' hairdresser (and the victim's family).

What will releasing the 911 call achieve? Investigation-wise I mean?

Don't get me wrong, I am morbidly curious too, but I don't lie to myself. We have no right to demand to see anything.