"Can't stay long, Mother," he said. "I'm up front, the prefects have got two compartments to themselves-" "Oh, are you a prefect, Percy?" said one of… - J.K. Rowling

When I've asked what the lack of female-only spaces would mean for women of certain faith groups, or survivors of sexual violence, the response is an almighty shrug. Over and again I've heard "no trans person has ever harmed a woman or a girl in a female space", the speakers' consciences apparently untroubled by the fact that they are parroting an easily disprovable lie, because there's ample evidence that men claiming a female identity have committed sexual offences, acts of violence and voyeurism, both inside women's spaces and without. Indeed, the Ministry of Justice's own figures show that there are proportionately more trans-identified males in jail in the UK for sexual offences than among male prisoners as a whole. When this inconvenient fact is raised, I'm sometimes told trans-identified sex offenders "aren't really trans, they're just gaming the system”. Well, yes. That's the point. If a system relies on an unfalsifiable sense of self rather than sex, it's impossible to keep bad faith actors out.

"A breeze ruffled the neat hedges of Privet Drive, which lay silent and tidy under the inky sky, the very last place you would expect astonishing things to happen. Harry Potter rolled over inside his blankets without waking up. One small hand closed on the letter beside him and he slept on, not knowing he was special, not knowing he was famous, not knowing he would be woken in a few hours' time by Mrs. Dursley's scream as she opened the front door to put out the milk bottles, nor that he would spend the next few weeks being prodded and pinched by his cousin Dudley...He couldn't know that at this very moment, people meeting in secret all over the country were holding up their glasses and saying in hushed voices: "To Harry Potter - the boy who lived!

Harry — I think I've just understood something! I've got to go to the library!”
And she sprinted away, up the stairs.
“What does she understand?” said Harry distractedly, still looking around, trying to tell where the voice had come from.
“Loads more than I do,” said Ron, shaking his head.
“But why’s she got to go to the library?”
“Because that’s what Hermione does,” said Ron, shrugging. “When in doubt, go to the library.