Mermaids, a charity that supports trans young people, wrote a measured and respectful response to JKR’s blog, and I think it is worth reading as a contribution to the debate.
mermaidsuk.org.uk/news/dear-jk-rowling/
Obviously no decent human being thinks the kind of abuse that JKR (and others, unfortunately including others on the opposite side) have been subjected to is acceptable. That is always to be condemned unreservedly.
@MoaningMinniee and @Maybe83 you can rest assured that no under 18, let alone any 4 year old (!) is subjected to life changing “sex change” surgery in the UK, or, as far as I am aware, anywhere in the world. That would indeed be child abuse - however, it simply does not happen. If you genuinely did not know this, then I hope you will be glad to hear it.
Sometimes, after extensive counselling, some preteens are given hormonal drugs to delay (not ultimately prevent) puberty. When they withdraw (or are withdrawn) from this therapy, they inevitably experience puberty, albeit delayed.
The reason they are given this hormone therapy is so that if they ultimately do decide to “transition” fully, they are able to feel much more comfortable, and be much more likely to be widely accepted in society, in their transition bodies. This therapy was not available to earlier generations and has undoubtedly meant much heartbreak. Many teens are not able to access this at all and must go through puberty and address (or not) their feelings once they are 18 or older.
It is likely - though admittedly not entirely certain - that such puberty delaying drugs do not ultimately have significant effect on fertility. (As I mentioned above puberty does result when the drugs are withdrawn).
Obviously the decision to give such powerful drugs it is a difficult one, and is jointly taken by children, parents, physicians and psychologists, over an extended period, and working together. Many parents and children have reported that the overwhelming relief brought about by allowing time for delay and reflection, is worth the potential (not currently confirmed) risk to fertility.
Those on all sides of this debate need to educate themselves beyond media headlines, and listen to children.