Imagine your best, sweetest female friend. Now imagine you find out that many years ago they were born a man, they just had surgery and chose to keep it a secret. Now imagine your friend getting sent to a male prison. That is what you are arguing for.
But it's not about your "sweetest female friend", is it. StormTreader? There is currently case after case after case of men who have committed horribly violent crimes, including multiple rapes, who suddenly discover their vulnerable, "female" side, and demand (with vociferous public support) to be put in the women's prison estate. Their crimes are reported as women's crimes, and they are presented as the victims of a cruel, bigoted establishment, instead of the violent woman-hating assholes they are.
This year we got the unedifying spectacle of a multiple rapist, "Lisa" Hauxwell, whose only attempt to transition was to change their name from Craig to Lisa, put on earrings and eyeshadow, and who then went on the run. The Crimewatch and other media reports reported this rapist as a woman, and it a completely predictable twist, also warned viewers that "she may be living as a man". Hauxwell IS a man, a fully intact man, and a rapist, and was rearrested while "living as a man", which merely meant that he'd wiped his eyeshadow off and put on a hoodie before being recaptured. But that didn't stop all the reports referring to "her".
Can you not see how far down the rabbit hole we have gone, Storm?