The silence is deadly. You see much speculation from non-locals, but I don't see much from the ones who live in the community. I would love to hear local theories.
There was a lot of, not exactly speculation, but locals who immediately expressed reactions to the crime which indicated some knowledge of the backstory. Also people who were sure the killer had been caught right away.
It's possible people expect that the cops to know, since JC named her killers. They don't realize the cops need hard evidence. The fact that the killer was in custody makes them think the cops know who did it and can arrest him. Maybe someone will realize they can't convict without hard evidence.