We live in a world where sex-crazed pigs are shoving their jollies down the throats of anyone who participates in society. I can't do literally anything without having coomerisms waved in front of my face, be it online or otherwise. I can't go shopping for my own clothes, god forbid undergarments, without having actual softcore porn shoved into my face; there is no need for the models to be posed sexually or making the fuckfaces that they do unless it's to attract male sexual attention rather than the dollars of the women who wear them. So many dudes are incapable of making any kind of media that they themselves would like without plastering sex all over it. These freaks can't even enjoy cars without putting some whore on the racetrack with a flag or oiled up and sprawled across the vehicle's hood. I can't tell the difference between the average modern chocolate commercial and the opening to an actual porno. I can't think of a single game off the top of my head that is free of coomerisms without it being a children's game like Animal Crossing, but even that game has shit like Tiffany. Pokemon has slutted up characters of all ages, including adolescent girls, for pity's sake.
Now with all of that taken into consideration, look at why troons and crossdressers are what they are; they're pornsick, coomer sex pigs taken past the already unreasonable norm that permeates today's society and daily life. If the average man can't handle not seeing sluts in all of his video games, movies, desktop wallpapers, commercials, calendars, etc, how much further do you think someone even more pornsick feels a need to go? The only direction they have left to go is to live the fetish when seeing it constantly just isn't enough. Furries have been doing a lot of the things troons do, but for a lot longer, though not nearly as "successfully" as the troons.