So you go back 30 or 40 years to try to prove something you claim is happening today?
Yes, when you want the accurate historical account of a progression of a thing up to the present day, you go back in time. And you select the best witnesses closest to the action with the most credentials who can tell you all about it. Don't become an attorney anytime soon. You don't want to lose money.
And BTW, I can see this topic makes you nervous. Hence your assignment to come and try to derail it.
Do you think the US Supreme Court with Ginsburg (having publicly declared that she adamantly doesn't believe equality means shared restrooms between sexes) on board will place the stay in the interim in these two cases on 1. Women and girls (1 in 6 who have been raped by a man invading their intimate privacy) having their expected segregation behind doors marked "women" or 2. Men pretending to be women having access to segregated chambers marked "women" on the door outside?
ie: whose civil rights and mental well being will be considered more immediately important?