What little bit I've read, I think that these two young ladies have a very serious lack of understanding when it comes to judging fantasy from reality. What I mean by that is that I read (somewhere on DU) that they were both into violent type shows. I do not blame the shows as much as I would suspect a lack of mental maturity.

Yes--we are just getting the bare bone right now-as far as useful information goes.
My experience tells me they may not get a view of reality from incarceration--though, no doubt, much has changed in a few years--I hope.

I think that you may be right here. It should start with a thorough Psychiatric Evaluation, and then taken from there. At age 12, I have a hard time believing that they are beyond being helped.

my opinion is that they need to be placed in a youth detention center with psychiatric treatment and re-evaluated when they turn adults.

I have worked in treatment centers, though--I wonder if they can deal with this type of a disconnection with reality.

treatment, but they may be too far gone to save.

When I was a 4th grader my teacher was an abusive monster, and at recess about half of my classmates and I plotted ways to kill her. We were serious, and we were capable of following through with it, but we couldn’t all agree on the best way to do it, so nothing came of it, and we forgot all about it by the time school let out for the summer. We weren’t psychopaths, and none of us were roughnecks or troublemakers. We were scared kids of the 1950s who’d been taught kids have no rights, and we were desperate.

We weren't paying homage to any fictional characters, but our collective mindset was probably similar to a reality game.

What their home life must be like.