For my case these members are just prostitutes for sponsors, staff, financors, CEO's etc.. You need to do cast couch if you want to stay at the "top" even if you have some talents. They start very young as most of the idols, and were abused to the core by their managers and people around them. I don't know if they are involved into adrenochrome for example. It's a good theory since some members doesn't age. But I can counter this argument, because it's just maybe their good genetics, or too much plastic surgeries/make up on the face who can give me this impression. But it still possible it's about adrenocrhome. Kim Kardashian brings the trend of Vampire lift in my country, with our own french celebs who do surgeries plastic or injections medecine ( tv reality show stars )
It's the fact to inject your blood in your face with injections. And it's promoted in peace. So just with this example, we never know what are they ready to do. Difficult to imagine one of them beat, r*pe, or eat some children or babies. ( Shia Laboeuf who said he had seen Steven Spielberg eating whole babies without really joking by the way..)
But I won't be surprised if one of them or some of them had sexually assaults some fangirls after performances for doing sex with and in a bad way ( drugging their targets for example) because of the alcool, drugs, pression, and the worse : god complex. If there are anything like that, so they are cover up and really protected.
You spoke about black market. In this, you have prostitutes trafficking. Children, teens and pre-teens. It's more for the superiors to entertain their masters. But if they have some favorites members, it's totally possible they can be involved too, and in this case they are victims and abusers in the same time.
They need to go this far because it's in their contract. If they want to keep all their insane privileges, and don't want to be unleashed in the nature to be poor and nobody again, they should obey. They can hold you with sex tapes or threats against people they can possibly love.
In their world, it's about threats, blackmailed, menace.. omerta is powerful and it's a real thing.
This man has spoken on his live before his death. But he was found dead some time after speaking about crazy things in the industry in general. And after, you've got Tom Hanks who trolled him, posting a very weird picture on the same place, where this ex actor was find dead. On road 66. Only that. His name was Isaac Kappy. He was famous, but not too much too, he has spoken of big names, and he was dead after.
So imagine the same thing now, but with BTS members