The mechanisms by which unfounded theories and ideas - the Dutch tulip mania in the 17th century, the South Sea bubble in the 18th - take hold only become clear in retrospect.
Future social scientists will look at the mid-2020s and will find reasons why an idea which is demonstrably at odds with scientific fact - that some people are born in the wrong body, and that they can change sex - gained so much traction in certain societies that it exerted disproportionate influence over education, law, media, religion, medicine, etc.
Taking the UK as an example, it is difficult to explain rationally how a tiny percentage of the population - approx 250,000 people in a population of approx 69 million - could successfully make demands like obliging people to misuse language, to lose their single sex spaces, and demand special toilet facilities everywhere - for 0.03% of the population!
It's too soon to explain how the fact that some people [myself and many other posters on here included] have difficulty with the gender stereotypes that coincide with their biological sex has been turned into a noisy, sometimes violent movement for 'trans rights', which turn out not to be rights at all - because trans people have the same human rights as everyone else - but extra privileges, disproportionate to their number.
The internet and social media will probably be found to have played an important role.
I suggest that the anti-women nature of transgenderism - it co-opts women's identity by making 'womanness' something that anyone can have regardless of their sex, and thereby appropriates women's rights as well as identity - gave it extra fuel to power through societies, as a backlash to the achievements of the women's movement. Women were never going to be put back in the boxes we had escaped from, so transgenderism had a role in undermining - and sometimes ridiculing, as in drag - women as a distinct social group.
If the group 'woman' in fact contains anybody, man or woman, what is the meaning of women's rights, women only spaces, etc? They have no meaning.
I think that the transgender movement has been used as an instrument - there are others - to give men the means to attack women, sometimes literally, as in literally, as they have done for centuries, but this time under the guise of being liberal and progressive supporters of transgenderism.
The rocket-fuel that propelled such a tiny percentage of the population into such an inexplicable position of power and influence - while claiming to be 'the most marginalised'! - is running out, as evidenced by legal victories and shifts in public opinion.
To transpeople- their rights and no more.
To women - our rights and no less.