Hi Justine
Firstly, thank you. The importance of Mumsnet's stand really can't be underestimated.
I think the key issue is that the dynamics of power are not being fully recognised.
Women posting here do not have access to the legal, political, media, financial or social media power of TRAs. Many have tried to speak with MPs and either not being able to or brushed away (MPs have been briefed/ lobbied by GIRES, Stonewall, Pink News, Mermaids, Amnesty etc).
The narrative has been constructed (by those who have power) that those with concerns are 'so called feminists' transphobic, 'anti-trans' & bigots at best, Nazis akin to the KKK at worst.
These accusations sit unchallenged.
There is also an issue of power here on this board. There are some posters who come to deliberately derail and goad. Sometimes they last less than 24 hours, sometimes they stay for weeks. Not to debate, but to control. Its not civil. (Im not going to mention how posts here are used elsewhere). When the worst of their comments are deleted this benefits only them. The opinions that are deleted such as the appropriation of hysterectomies, infertility are not uncommon. If when we identify this and challenge it the comment is deleted it is us who are disempowered. I was personally involved here & an important opportunity to stand up for women who have had hystectomies, gyny cancer and / or are childless was lost. It was pretty upsetting. There are many women in similar circumstances to mine that are MN users too.
Derailing has happened on a thread here discussing concerns for a schoolgirl in America wanting to assert her right to privacy, homeless women (one of whom was murdered) and female prisoners. Serious concerns about vulnerable people which if derailed elsewhere on Mumsnet would likely get short shrift.
It has also happened on two threads which I started about the successful mass targetting of Lisa Muggeridge. Her voice is very important. I saw how this happened on Twitter and also read about the massive impact this has had on her and her daughter's life. I would urge you to read the whole thread, especially her own comments added yesterday here. I dont know if you are able to access the zapped first thread, if you are you will see how it was derailed. The context is really important and exemplifies the issue of power; who has it and how it is used / abused.
Finally, I would ask you to consider that it may be that it is the new guidelines which have been 'weaponised' by some and that threads such as the one in question are a response to women feeling disempowered.