I've heard it said that Nicola Sturgeon is so motivated to allow this to be pushed so hard by the ideologues running the show there because she was so against same-sex marriage, and now feels remorseful. Obviously, the fact gender identity ideology utterly shafts same-sex attracted people has completely passed her by, which shows how much they actually mean to her. She's just frightened to be caught on the wrong side again.
Which is funny really, because she absolutely will be remembered for the horrific effect her government has had on the rights of women, children, and LGB people in Scotland.