This is a good point. A lot of cults have this problem.
As others have pointed out, child sex abuse is obviously very real, and PTSD is real, but the satanic panic/satanic 'recovered memories' scandal was not. Satanic ritual abuse has been debunked over and over, and the "memories" children recovered of it were discovered to have been unwittingly planted by well-meaning therapists; children have extremely plastic brains and are obviously susceptible to this sort of thing.
I wanted to bring up an important link here, though. One of the major, famous proponents of the satanic panic was a developmental psychologist named Diane Ehrensaft.
psycnet.apa.org
Diane Ehrensaft, despite the fact that she is obviously a crackpot responsible for ruining lives and careers, is still employed as a psychologist and is well known...
as a prominent advocate for puberty blockade and pediatric transition. She is a nutbar who believes, among other things, that children can "pre-verbally signify" gender identity as early as the age of two, by (among other things), removing barrettes to signify masculinity, or unpinning their diapers to simulate a dress.
I desperately wish I was kidding.
These are the kinds of "experts" people are listening to on this issue, and that's why we are going to wind up with a lot of people like Jazz, who are desperately trying to cope in an adult world without ever having developed adult cognition.