Consider prisons, for example. There have been many cases recently of male criminals being transferred to the female prison estate, on the basis of their self-declared so-called "female gender identity", who have then raped and in some cases impregnated women incarcerated with them.

It should be obvious that the same risk is not present from other female prisoners. Even if they happen to look very butch and/or hirsute. So keeping prisons single-sex is clearly a much better policy for incarcerated women.

Even for bathroom spaces, the prospect of laws that penalize males who decide to use female bathrooms is good news. This is because the threat of negative consequences for such behavior makes it much less likely that any such males will even bother trying, which means that women in general will not only be safer, but also can feel safer, because they know that any individuals encountered in these spaces are almost certainly female. Even if, like Buck Angel, they don't conform to feminine stereotypes.