Your links lead to FTP links, Nemo. Might wanna fix that.
Horrific as this is, I never agree with charging juveniles as adults. From what these articles say, these girls need MAJOR therapy alongside their punishment, which I can tell you from experience they're unlikely to get in the prison system unless they join one of the many "[Insert Issue Here] Anonymous" programs. If they're so lost in a fantasy world that they think making a sacrifice to Slenderman will let them escape their mundane, everyday lives, there are clearly deeper issues than a fascination with creepypasta. I've loved horror movies and stories since I was younger than they are and I never felt inspired to kill anyone to prove my devotion to any figures in them.