Oh my god, where to start with this autism? First off, the vast majority of pedophiles are males targeting female children.
82% of child sexual abuse survivors are female, so if your bullshit about gayness being caused by CSA was true, there would be way more lesbians than gay men. This obviously isn't the case.
No one yet knows the main cause of homosexual behavior, but I can assure you that it's not "brainwashing," because numerous wild animals engage in same-sex couplings. For instance,
bats have one of the highest rates of homosexuality of any mammal, even higher than humans. I don't think fruit bats, whose brains are the size of walnuts, are capable of brainwashing.
Some scientists have suggested that homosexuality in bats was an adaptation the species acquired over time as a means of reducing the amount of conflict between males within colonies, resulting in closer-knit, stronger colonies.
For funsies,
here's a video of some bats blowing each other. Yep.
However, transgenderism specifically as humans do it is not present in the animal kingdom. If an animal like the clownfish switches sexes, it's because it's part of their reproductive/life cycle, not because the clownfish hatched with the "brain" of the opposite sex. Clownfish do it out of reproductive necessity. Humans do it because they think liking superficial things about the roles of the opposite sex makes them that sex, and also because they often have undiagnosed/undertreated mental illnesses.
Finally, you'll find that quite a few gay people, particularly lesbians, are also against troons.