Every time this happens (moved to main board) a whole load of people come along and say, we are wrong, it's a fabulous charity, you lot are a banned term, I dont care, why is this shit on the main board, etc etc. Seems plenty of people have no critical thinking skills at all and cannot see that one event happening could very easily lead to worse.
Safeguarding specifically forbids teachers/coaches/adult volunteers from interacting with children in closed groups on line.
Why is Mermaids allowed to ignore this?
How you phrase things is crucial.
As I say there is a clash of concerns here.
If you were to ask a question along the lines of would you be concerned about you child using a closed forum with adults on? , you'd get a very different response to one about would you be concerned about your child being on Mermaids forum?
The same poster could easily be worried about the former but fine about the later precisely because they trot out lines about how they work with the NSPCC. Its a matter of brand trust and regulatory trust.
But those organisations are only ever as good as the practices they follow. Talking about those practices without making reference to particular organisations might be worth it from the point of view that you talk about the actual issue, without hitting the cultural identity barrier that trans represents.