1st, as I said, this is an unproven hypothesis. 2nd, the dominant impact on reported prevalence rates are 1) social acceptance of those identities, and 2) the relative risk in revealing those identities.
If being stoned to death is the risk faced for being gay, people won't tend to admit to being gay to a researcher.
> social acceptance of those identities
Why would it not work the other way too? Maybe the Western society is hell bent on putting people into boxes, whereas people in third world countries are willing to look the other way for minor deviations [sic] as long as they're useful to their family / village / society?
If you didn't imbibe in your children that the only way to be a "man" is to be the jock on the football team, then maybe far less people would be suffering the dysphorias. Just like how exposure to Instagram causes body dysphoria in both young men and women.
Sexuality is so front-and-center in the Western society unlike many of the third world societies which are below in the 'hierarchy of needs'.