But..... we are going to put them in there anyway. Because fuck women.
Because somehow, when coming up with the policies and laws which facilitate this (and which were the reason the judge said no law was being broken by doing by deliberately exposing women to preventable harm) it didn't occur to the law-makers and policy-makers that there would be any conflict of rights in doing this.
Because the male prisoners in the male estate would be fine, and the male prisoners in the female estate would be fine. Win-win, surely? Gosh, aren't we kind and inclusive and wonderful!
TLDR: Because fuck women.