There are a number of reasons mankind will look back at this current era as a dark period in history. Giving children hormones and puberty blockers, and, in some cases, mutilating their bodies to make them look like a member of the opposite sex will be one of the reasons. This is rapidly becoming the greatest pseudoscience of our age.
Link: https://quillette.com/2019/09/24/no-one-is-born-in-the-wrong-body/
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The empirical evidence (Nordic countries) suggests
But not before they're fully developed mentally, which happens around the age of 25.
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If you wait until they are 25 you present all kinds of complications from the hormones that flood the body throughout puberty. You could end up with Phil Hartman on Sprockets rather than the dude/dudette from The Crying Game.
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Additionally, we would expect suicide rates to be substantially lower in those Scandinavian countries you mention, where "tolerance" is highest. Instead, we see extraordinarily high suicide rates, like we see elsewhere, which points mostly to internal, rather than external, factors to explain these rates.
Anecdotally, every trans kid I have taught or encountered is a child on the periphery of his/her peer group. Not a single one could be described as "popular," and I'd be shocked if any others have observations that are much different. They're kids who are almost always dealing with psychological issues and certainly social challenges. "Coming out" as trans garners attention and provides a connection to other peers who have done the same. Additionally, it now provides power, as these kids can dictate language and, at times, get adults in trouble who do not conform to their language or accommodation demands. We have seen two notable, publicized cases in which teachers were fired for not conforming to pronoun demands.
When he observed that none of his patients actually became happier. Now he is a pariah. Very politically incorrect.
Notice that having a dogmatic secular worldview does not preclude you from disseminating your ideas without denouncement? In fact, it endears you to the unintelligentsia.
As I said before, the height of sophistication and enlightenment in secular Western culture is to embrace all things LGBT. It even trumps race. You can be enlightened and be woke on racial issues, but if you to reach towards nirvana, you must learn and speak the dogma of the LGBT movement.