You just say whatever you think with no supporting evidence.
Viewing ones unsupported opinions as more accurate than science (especially in a medical context) is considered delusional thinking by the psychiatric community and it's definitely indicative for a referral to a psychiatrist.
.Your opinions have been voted down so many times this thread is filled with your dead comments and not a single person has vouched for you other than me. I can no longer vouch for you.
Also youre flame baiting which is a clear violation of HN policy. @dang
You probably need to take a class on improving your poor reasoning skills and as another poster said: seek mental health care.
It's probably still a holdover from when San Francisco wasn't as crowded and had adequate access to public restrooms.
It's not really an issue in most of the country because there's at least adequate public restroom access.