You are conflating seperate issues. Your guy in china example is not what most of us here are talking about.
*Young people who are close in age but one is legally underage.
*Citenzenship.
*How should society treat those charged and found guilty of child sexual abuse.
I agree that a 19yr old with a consenting seventeen yr old (for eg) should not be branded for life.
But, these cases are a distraction from the the majority of what most people consider to be child abuse. That is someone of legal age touching a child sexually that is too young to know what's going on or how to say no.
Many pedophiles spend time grooming victims are charming "nice" psychopaths or narcissists that earn the trust of the child or threaten the child if they "tell." It's the duty of orgs to know what is now common knowledge of the psychology about this stuff and structure their policies around that IF and that's a big IF, IF they care about protecting the children they force to go door to door and to meetings and the children in the houses their members visit for bible studies.