I know someone who is somewhere in the process of MTF transgender reassignment (admittedly have not seen her in some years as lost touch/moved area, but we are still FB friends and she communicates lots of news about her transition via FB).
As a man, this person was a strapping six footer and then some, and participated in lots of sports. Obviously going to be physically stronger than most women whatever gender and sex he/she is.
If this person was a violent sex offender convicted of rape as a man, even as a woman she is going to present a threat to weaker vulnerable women in a prison environment.
Apologies if I have not used correct language. People are people as far as I'm concerned. I don't care. But it just seems a little too convenient for sex offenders with penises to try to join in with 'I identify as a woman' in an attempt to be imprisoned with women, who are mostly vulnerable and in prison for often seemingly minor crimes.
People with penises commit the vast majority of crime and a disproportionate amount of violent crime. I'm not saying that people with vaginas do not commit violent crime and I'm sure that there are people with vaginas that have raped people with penises when you use the definition of forcibly insertion of objects but the vast majority of offences will have used a human penis, so that is how people have to be segregated.
It has always been the norm that changing rooms, toilets and prisons are segregated to male or female and it seems that the right now the rights of a small percentage are being prioritised over half the population that have often been treated as second priority.