Augustus
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First, available evidence shows that only a small minority of trans children "desist" or "grow out of gender dysphoria." The "60-90%" claim is overwhelmingly false and unevidenced, at least if we go by current science and not fringe voices:
Transgender kids tend to maintain their identities as they grow up, study suggests
How many transgender kids grow up to stay trans?
The Controversial Research on 'Desistance' in Transgender Youth | KQED
I think this has to do with ambiguous expression.
Her claim was that 60-90% of those who experience gender dysphoria grow out of it, not that 60+% of trans kids grow out of it.
My interpretation was that she means people who question their gender identity as this seems to be the only context such a stat could make sense.
I've no idea about the stats, but they seem quite probable in this context.
Second, there's no evidence that "increasing numbers" of trans women are detransitioning. The wording itself is misleading: since transitioning is now more accessible and more socially accepted than before, any given percentage of detransitioning is going to result in larger numbers now that more people are able to transition. But the percentage itself hasn't been established to be large or to have increased in the first place: 2% (just a random number I'm using as an example) of 1,000 is 20, but 2% of a million is 20,000. The same percentage amounts to a wildly different number.
This is a recent scientific paper, to me if JK Rowlings views on detransitioning are 'transphobic' then this paper must be too as it pretty much says what she said:
Detransition is a growing phenomenon that implies clinical, psychological, and social issues. Inadequate evaluation and use of medicalization as the only means to improve gender dysphoria may lead to later detransition in some teenagers. Comprehensive care by a multidisciplinary and experienced team is essential. As there are no studies reporting the factors predictive of detransition, caution is recommended in cases of atypical identity courses...
In this regard, there is concern that more and more people believe hormone therapy to be the solution to their problems, not only those referring to self-identity, but also those referring to personal frustrations inherent to this phase of life. Some of these individuals visit the endocrinology outpatient clinic without prior psychological assessment or counselling, demanding urgent and hurried medical and surgical treatment....
The true prevalence of the phenomenon is not known but is possibly underestimated. A number of factors have been associated with detransition, though none have been validated to date.
Transsexuality: Transitions, detransitions, and regrets in Spain - ScienceDirect
Any valid concerns she could have expressed have been drowned out by her support for unambiguously anti-trans people (such as Matt Walsh),
In a conversation on twitter (which contained some disagreement), she said his film (which I've not seen) did a good job of highlighting some issues with certain ideological gender theory.
I don't think our society is in very healthy shape if such an interaction counts as 'support' for all a person's views and constitutes a significant moral failing.
hasty conclusions (e.g., the idea that men will intentionally identify as women to assault women in bathrooms),
This is a point about male sex offenders, not transwomen though, and we know humans will take advantage of systems for their own benefit.
It's not going to be a deluge, but it's bound to happen sooner or later. As such it is fair to note and for people to have concerns over.
There are many ways to talk about these issues and discuss them productively, and I do think that some people are too quick to react negatively to even the suggestion that, say, trans women shouldn't automatically be allowed to compete against cis women in sports. But J. K. Rowling seems to me a clear example of someone whose input on the issue has been unproductive and harmful far more often than not.
People have opinions on issues they care about, and high profile people get heard.
The chap who was 'debunking' her in the article wasn't a scientist and was offering his opinions (many of which don't seem to accurately reflect what she said), why are his opinions more productive?