Correct me if I'm wrong, but my understanding is that those texts were released by the Buttons in order to imply that SH prostituted herself to Katz. Moreover, they alleged that SH's mother helped SH launder the money. The Buttons are doing this in order to cast doubt on SH's claims that the Buttons abused her.
From what I understand no one is allegaing that SH was trafficked. There is concern that she was trafficked, but if so the obvious concern is that the Buttons trafficked her. But, again, the Buttons are the source of the texts.
Do I believe that Katz is a giant sleezeball? Yeah, I do.
Is he worse? Quite possibly. Does have a relationship with the Buttons? Did he get introduced to SH through the Buttons? If the answer to either/both is "yes", Katz goes from sleezy to radioactive.
Realize that there's not much patience for complexity or precision, but there should be.