Short answer? People like being scared or overwhelmed once in a while. Some folks have a bigger appetite for that feeling than others. Back in the late 70’s I recall hearing about this new film series called ‘Face Of Death’. I heard about it, but wasn’t all that interested. Many others were.
In today’s era, we have another film called SAW.
Just that name alone, I knew it wasn’t for me. It’s very popular with some. Quentin Tarrantino movies too. Big time!
It can start with younger kids too.
I recall the fad of Cabbage Patch Kids was jokingly parodied
by a deck of playing cards called “Garbage Pail Kids”
That deck showed a lot of vulgar and gross distortions of diseased animals and cartoon characters.
with garbage pail kids you did get some bubble gum to chew
I liked the Odd Rods myself
Short answer? People like being scared or overwhelmed once in a while.
When I was a bit older than 13, a movie, Mondo Cane, was released. I remember seeing it, but I’m sure it was age-restricted at the time. The fact that you had to watch it in a movie theater meant that there was there was at least the semblance of a gatekeeper involved. Today’s kids don’t have to deal with that unless their parents are very diligent.