There was a post on twitter a few days ago by a GC feminist (I can't recall who, sorry) where, to paraphrase, she said she wished she'd understood when first entering into this debate, that you might as well be hung for a sheep than a lamb.
Essentially she was alluding to the reality that however tentatively and sensitively you support a position/opinion that doesn't fall behind the total capitulation of sex based rights you're vilified as a TERF.
The thing is, I feel this TRA tactic is now working to our advantage.
More and more people with a large following on Twitter are falling foul of this.
It often starts with a back track, but slowly they seem to build up a head of steam as it were and over time become increasingly more outspoken as they realise there is no "middle ground" to be found in dealing with TRA's.
@Glinner is a cracking example of this, but you can also seek people like Robert Webb and Alison Moyet who increasingly seem to be "breaking ranks" to various degrees.
I can't pretend I know what JKR thinks about this issue.
However, I do believe she is a feminist and feels strongly about women's rights.
I'm really glad to see her doubling down in support of JT's article and it's equally heartening to see that twitter thread from "Owl" being robustly torn apart for its misogyny.