Over the past week, Harry Potter author JK Rowling has caused controversy with a series of harmful tweets – and later a 3,600 word essay on her website – about trans people, arguing that only women menstruate and weighing in on the tired ‘trans bathroom’ debate. “When you throw open the doors of bathrooms and changing rooms to any man who believes or feels he’s a woman – and, as I’ve said, gender confirmation certificates may now be granted without any need for surgery or hormones – then you