@J12t because "going to the other door" is already a violation of the norms, works as a deterrent and can be guarded from outside in the public view, while it's a lot harder to guard a place where malicious actors can walk inside "freely", people are supposedly more vulnerable and expect privacy?

Somewhat related: do you see a need for gender-segregated locker rooms in the gyms, or should we get rid of those as well?