Because that's where it all begins. The anime-to-troon pipeline is this; they've taken the heroic archetypes that have empowered young men to transition from one phase of life to the next for as long as stories have been a part of our lexicon and feminized them over and over and over until the ideal they carry isn't that of a masculine archetype at all, from there they are introduced to more and more degeneracy. You remove the father figure and all rites of passage, this is what you get. They cannot imagine themselves as men, so they cling to these things; eventually they want to be perceived as these archetypes. Psychologically it is something akin to wolves being domesticated into chihuahuas, but through the anime pipeline.

The anime avatar is the thin, paper mask that separates them from the reality of their situation, the reality that they will never be a cute anime girl. You can be Hercules, you will never be a woman.