Who was talking about sexual predators? This exchange was about sports, please do keep up.
I brought it up specifically in the example of EC's complaint about zero sum numbers of scholarships or slots on teams.
For every trans boy playing on the boys side of the equation, that's one less person girls are in competition with for a limited number slots on teams or scholarships or whatever.
EC seemed to be describing this as an entirely one way street, but it's not.
The net effect is that more team spots are taken by biological males and fewer by biological females. That's because trans men (biologically female) are less likely to make the male team. So the spot cleared by the trans-woman athlete on the male team does not go to the trans-man, but to another cis-man. (Generally. there are always exceptions.)
So a female potential athlete, who transitions for the most part removes themselves from the athlete pool. The male potential athlete who transitions inserts both removes themselves from the male athlete pool and inserts themselves into the female athlete pool. It's not a balanced equation.
That said, there are a few females (trans or not) who are able to play on the men's teams. Usually in sports that don't have a female counterpart, like wrestling or football. And yes, that might deprive a boy of a place on the team. It is notable, however that the same accommodation is rarely made for a male who wants to play on the female team even if there is no corresponding male sport. (Around here, volleyball is an example. Huge female sport in jr. high and high school. No male teams at all, and no local male clubs.)
It's a complicated issue, which I think should be left for sports leagues to make informed decisions on, not lawyers and politicians. My personal opinion is that decisions should be made on a case-by-case basis by the governing boards of each respective sport.
One thing to make note of is that, as I understand it, the leagues and the governing bodies that school sports teams participate in are not government entities. In Illinois, for example, the IHSA is governed by a board elected from and by high school principals of member schools. Some public, some private. the IHSA (and it's junior high counerparts. There are at least two.) is, in turn, a member of the National Federation of State High School Associations. Also, a non-government association. (Just as the NCAA is not a government body.)