[user104658]

The sad irony is that we'd probaby be lightyears ahead on trans rights and safety if it WAS acknowledged that trans women are not women, but people who have chosen to live as women, accepted that for what it is and set about finding innovative solutions for trans people specifically that have nothing to do with trying to shoehorn them into women's spaces and women's rights. Trans people (the ones who were already trans - not the ones who fake it to get into a different prison specifically) genuinely are both;

1) A risk to women in women's prisons, even if non-violent, they are a psychological risk to a building full of captive traumatised women.

but also

2) At significant risk of harm in male prisons.

The real issue is never going to be addressed if we just keep pretending that one or the other "must be" the appropriate decision.