"If transgender identity were an innate trait, like left-handedness, we would expect identification rates to rise at first when it became socially acceptable..."

"... then plateau and remain stable at a fixed level. If the phenomenon were instead driven by social contagion, we might expect a boom-and-bust pattern: a spike followed by a rapid decline once the social forces driving it weaken. Recent data offer a mixed picture.... The overwhelming majority of those driving the trans craze fall into the 'nonbinary' category -- adopting identities which are said to be neither, both, or somewhere between male and female. These include labels such as 'demiboy,' 'genderfluid' or 'two-spirit.' These are social identities, not biological ones. Unlike left- or right-handedness, which describe objectively measurable traits, 'nonbinary' identities have no anatomical or physiological referent. They are conceptual, political and responsive to cultural trends.... The social-contagion hypothesis was never hateful. It was purely descriptive: a recognition that social and cultural factors shape human behavior...."

I'm reading "Evidence Backs the Transgender Social-Contagion Hypothesis" by Colin Wright, an evolutionary biologist, in The Wall Street Journal.