From an extremely legal take, there is no culprit, only suspects. For there to have been a culprit, a detective would have had to look into it and obtain enough evidence. This is called taking justice into your own hands, and it has caveats.

We can all assume the stereotypes of the persons who did this, and for all we know it was probably them, but going on witch hunts is just that.

I think the victim would have been better served by making the matter less about who created what and focusing on that the school seem to be consenting to pedophilia involving one of the victims to be recirculated and that they took action against her for taking matters into her own hands. Because there are much better legal grounds and evidence to support that claim, at least from what my Internet armchair lawyer degree can back up.