People think displacing women with men who identify as women in women's sports is somehow a reasonable thing to do. It is not.
thebewilderness I can see why you might think a woman had been "displaced" in women's sport, but that's because you're a feminist first and foremost. I am a feminist, but I am a sportswoman first and foremost, and we would all do well to recognise that "women's sport" is not a feminist institution. It is a sporting one.
What I mean by that is that women's sport was not created to further the feminist aims of celebrating female-only achievement. It was not created for the same reason as women-only shortlists for example, to positively discriminate against women, or to showcase women on an equal footing and in an equal limelight to men.
It just wasn't. That's not what it's for.
Women's sport is a sporting institution, and was created to further the fundamental sporting aim of inclusivity - allowing as many people to participate as possible - and allowing everybody to participate in such a way that remains safe and promotes fair competition (i.e. no forgone conclusion). Men's and women's were common-sense divisions to make at the time to allow both men and women to compete in a safe and fair manner.
In pursuing the same aims there are also disability categories, league structures, age-based divisions, veterans teams, regional competitions - everything in sport is set up to include as many people as possible whilst retaining safety and fair competition.
Women's sport is not a feminist institution.
Sport wants to reach as many people as possible as best it can, but it doesn't want to promote a particular group to particular success. Women are equally important to include as men in sport, but they are not more important; no woman is "displaced", except as much as any competitor is by any other. Sport is even-handed. It is for everyone.