See the new science about the proof
One study can't prove anything. Science has to be repeatable.
Many sports bodies have settled on being on HRT for two years and/or having testosterone levels below a certain level as the criteria for trans women to compete in woman's sports. This is based on the current science. As the science evolves, so will their policies.
The CT girls were already brought up. If you are going to convince me this is a big problem and trans girls/women are going to
ruin sports for girls/women, you are going to have to bring up more than 2 track and field stars and one swimmer in the entire country of 330 million people. All that does is prove my point that it's not a big problem that requires excessive energy to solve.
This is false. We invented competitive divisions for men and women in sports when people had much less understanding of both biological sex and gender identity than we do today. We didn’t all sit down in a conference room somewhere and agree that when we said “women,” we were referring to biological traits only. In practice, the attempts to define those boundaries have always been messy and some of the previous “science” that was used has been discredited.
This is true. If you look at the history of sports, at first it was only men who played because humanity thought that women couldn't even do sports. It would wilt their delicate flower or something. Then some women started playing sports and, since there weren't women's sports, they played with the guys. People didn't like that. So they started splitting sports up. Sometimes it was so women could win sometimes. But sometimes it's because the guys didn't like being beaten by a gal. But not all sports split up. Some are co-ed to this day.
Some people say that women will never be as good at sports as men but, if you look at history and how women have closed the gap over time, maybe someday that won't be true, at least in some sports. And, in some sports, women have an advantage. In endurance running, women have an advantage because we burn fat better (and have more of it). So the women didn't use to do as well as the men but now they are beating them.
Instead of all this hand-wringing, sports organizations could say that, below a certain level in the sport, kids can play on the team that matches their gender identity no matter what. But at the higher/elite levels, they have to have been transitioned already. This is one example of a policy that would stop trans girls from setting records (which seems to be what is the most upsetting to some). If trans kids want to play sports because they love them and it gives their lives some normalcy, this policy would be fine. They can play in a recreational or lower-level league and have fun. If they want to go to the Olympics, they have to transition medically.
I'm sure there are other solutions that would work as well or better that don't involve hurting trans kids who are already hurt a lot by society. We just have to think of them.