Right now ant-transgender activists, left and right, are trying to tell the world that the current rise in the number of transgender people is caused by a transgender conspiracy.
RightLeftRightWrong tells a similar story about left-handed people:
The history of the sinister left-handed
In pre-modern times left-handed people were thought to consort with the Devil. Left-handedness in women might be considered proof of them being witches.
In the 19th century science and medicine were used to fight the threat of those left handed:
The infamous (but influential) 19th Century physician Cesare Lambroso, who identified various facial and racial characteristics with criminal traits, turned his attention to handedness at the end of the century and the start of the next and, perhaps not surprisingly, he identified left-handedness as a mark of pathological behaviour, savagery and criminality.At the middle of the 20th century American psychoanalyst Abram Blau suggested that left-handedness was caused by perversity and the result of emotional negativism.