To lazy to reply to all posts but...
Just because someone turns 18 doesn't mean they're mature. They're mature enough to understand that if they step out of line, the consequences of their actions are more severe now as they're considered legally adults, but people still are developing maturity, intelligence, impulse control, and all that makes us functional adults.
With that being said, Jazz being an adult, and I'm talking specifically about Jazz here, means nothing because he is emotionally, physically, and mentally stunted. He's a child and he's never gonna move on that phase of his life, so asking him to act like an adult is like asking a 10yo boy to get a real job and start working and expecting they will produce good results.
Also, Jazz thinks he's been "cured", and the disease here ain't being trans, but being a girl who was born with male organs, which they need to remove and modify so he can be a true girl. For him, people criticizing the procedures are as bad as someone who would protest a person receiving an organ transplant to live. Even with the limitations of his body, he's been "allowed" to be a girl as much as possible, so he truly can't understand why we're bad towards him. Not only this is his reality, but his underdeveloped brain might never, at least on its own, have a little bit of scepticism about what "being truly a girl" even means. He just can't put two and two together like most people his age can, nor he has the curiosity of learning beyond what he knows because he lacks the brains for it.
So, we can't really blame Jazz if he doesn't speak against what happened to him, because he doesn't understand it. He believes trans kids have been cured like he is in the same way a child is convinced the tooth fairy is real. Their brains can't function beyond what their parents have told them and faked for them to believe: money is been left here, my parents said it was a fairy, so there is a fairy. He was told about the Vagina Fairy, for god's sake. He's that underdeveloped. There are others who managed to step out the lunacy and realized they were misguided into ruining their bodies, but Jazz ain't one of those people.