If inducing trans and gay were that easy it would be as easy to cure it. It isn't.. Trans is so incurable that despite the side-effects it is considered much easier to change the body than the mind.
But I agree with your second paragraph. I'd say that there is such a thing as information hazard. You need anti-memes for such. And best before being exposed to the info-hazard. Kind like an innoculation. At least as a minor when you don't have a sufficiently general mindset to dispose with such ideas easily (stronger immune system).
My model is that there's a sliding scale of how you'd identify your gender, and there's strong social pressure to conform it with your sex. As a result, only people who strongly want to identify their gender otherwise will. Another way to think of it is that the reason it's so incurable is that society automatically cures all the easy and medium cases.
There's instructions on LessWrong for how to become bisexual. If it's that easy for a heterosexual person to become bisexual, shouldn't it be easy for a homosexual person to become bisexual? It's the same issue here.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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