Not a bug but a feature

When something occurs with high predictability and consistency it is not a bug but a feature. In other words, 100 years for now I can predict with great certainty that a segment of the population will be some shade of gender variant. The only thing I cannot predict will be society's reaction and embracing at that time period. 

Judeo-Christian orthodoxy was always restrictive. Not only was intercourse before marriage prohibited, but any divergence in sexual orientation or gender behaviour outside the norm was seen as a sin. Never mind that it had always existed, they just didn't form part of a "normal" that had been decided upon by concensus of the ruling class and the clergy for millenia. Any natural divergences among the population were kept strictly hidden. 

It wasn't until the 1960's that questioning and rebelling began in earnest about full liberation of all people who did not fit within the restrictive rules. Stonewall happened as well as a woman's liberation movement which became particularly fervent and militant. 

Fast forward to the 1980's and the beginnings of a pushback started to happen. The moral majority and other groups tried to put things back in the bottle. Not coincidentally, caustic theories about gender variance as mental illness began to sprout which had been wholly absent in the time of Harry Benjamin when scientific curiosity was more what drove things. A repressed European eastern block mentality brought Kurt Freund's ideas to the CAMH in Toronto where they were adopted by Ray Blanchard. They were meant to shame and stigmatize people looking to transition rather than help them.

Unfortunately and much to our chagrin, what are also permanent features and not bugs are human stupidity, fear and hatred which is why we keep repeating history's mistakes.