Good ole fashioned "I'm just trying to protect them" bigotry.
Trans women (ie, men pretending to be women) must be
registered & regulated, perhaps even prevented from ever
being, because they pose such great risk of assaulting real
women in the restrooms that are their hunting grounds.
Statistics show that this is very common, with as many as
4 yearly occurrences of a real woman or a lesbian feeling
ill at ease in the presence of one of these trans woman.
Research has yet to discover what motivates men to
assume the appearance of women in order to assault
them, given that even as un-transformed men they
could easily assault women. But to address the problem,
Republicans have proposed legislation to require them
to have a scarlet PTBW (Pretending To Be Woman)
emblazoned on their forehead. Restroom & locker room
police can monitor who enters, with regular audits
performed by checking genitalia for compliance.