You yourself even present a solution for trans-women assaulting other women: because there are so few of them a third wing, even a small tier of cell blocks, can help. I presume there are additional steps that can be taken. Up the penalties for any type of attack, and for a any form of retaliation for reporting attacks. Have adequate supervision and surveillance of prisoners. House at risk attackers and at risk vulnerable people separately, perhaps in individual cells but not isolated as in solitary.Yes, that's being done in the UK apparently through a third separate wing.
Not necessarily. Do you have such a solution? Because if not, how does that position not equate to "We're going to keep putting male sex offenders in female prisons until we can come up with a perfect solution for all sexual assaults in prison"? It might not be the perfect solution to all sexual assault in prison, but that doesn't mean that stopping to put male sex offenders in female prisons isn't a good idea. And between a good idea and no idea, the former has first priority, right?
What is the alternative? Place trans-women in the male population knowing they will very likely be assaulted?
My last sentence in my post was that in reality we have to do much more to prevent all forms of sexual assault in prisons. But we can’t ignore the biggest problems, cis on cis assaults, because for some reason we are obsessed with the much, much rarer trans attackers.