True, there probably was a stressor. It is not the way to figure out who it was, though.
Any stress can be the precipitant, as stress usually causes insomnia, and insomnia itself can cause impulsive, or psychotic, behavior. But it is only the tip of the iceberg.
My theory is, it starts with imaginary world, and imaginary world has changed with the advent of the Internet. Before, people were writing diaries, stories, daydreaming, painting. Someone would see a troublesome writing (if anyone could see the diaries of the Columbine killers!) or a scary picture...
Now Internet has almost supplanted that old imaginary world. Gen Z is extremely visual. I don’t know if they “daydream” like the previous ones did, or if they just “see” it all online. I don’t know if blue light blockers could help, btw. I think Internet either gives rise to sadistic imagination, or merges with imaginary world, or something else.
My theory is, lots of people daydream, right? And some dreams can even be violent. But there is a moral line that defines what is “OK” and what is “NOT”, and also, the line defining dreams from reality. It is when that line slowly erodes, one day the imagination bursts into reality, merges with it.
But with the Internet, I think the process goes faster, or maybe, there is even no line. Because everything is so visual, maybe images become reality sooner?
ETA: what really interests me is why in some people (probably most teenagers have some erotic fantasies, and we don’t know what is in them) it never materializes, and in some, it breaks into unimaginable horror? What is the role of dissociation? If people feel almost “not themselves”, can they step over the line easier?
Also, about the “signatures”. It is probably something coming from the first time when it worked for them. A.S.’s cross was such a signature, but I doubt the cross came from the female jogger incident. Probably, from the Internet. Could the signatures be originating from the first time they got sexual release online? Can some of them be found online?
I think AS could also be consulted in the Delphi case.
Bolded by me.....no one said it was the way to figure out his identity. It was said that it is a component of the crime that will likely become apparent when he is interrogated or identified.