Respectfully, TransParentlyAnnoyed, there is no one-size-fits-all explanation (“trans men are just trans. they are this way because they are this way”) to the question. There are various reasons why someone may adopt a trans identity, reasons that contradict or conflict from one trans-identified person to the next. It is not bigotry to question motivations, patterns, and whatever possible psychological mechanisms are in play here. Sanctimoniously nailing the door shut is incurious and lazy.
I don’t believe anyone sensible is claiming that every single female who transitions does so for one universally identical reason. Human beings are terribly complicated, as you well know. Some may be responding to dysphoria that began very early. Some may be trying to escape sexualisation, trauma, homophobia, constrictions imposed on women - as others here have been anecdotally sharing. Some trans-identified females may be autistic and struggling with embodiment or social role. Some may be influenced by peer groups... online subcultures, pornography, internalised misogyny, the social cachet of adopting a trendy identity in certain circles. Some may simply be mistaken about what transition can solve. The point is that all these possibilities are precisely what is (and should always be) discussed.
It’s rather odd to to say, on the one hand, that trans-identified people suffer from PTSD, depression, homelessness, alienation, and abuse because of social pressure whilst on the other hand treating it as bigotry to ask whtehr trauma, alienation, abuse, depression, or social pressure might also play a role in the development of a trans identity in some people. It’s also not very persuasive to suggest that because transition can make someone’s life harder, it therefore cannot be motivated by anything other than some innate, unquestionable essence. People make costly choices ALL THE TIME for complex reasons. Costliness does not prove truth - it proves only that the person is strongly motivated.
Compassion and curiosity are not enemies. In fact, I would argue that real compassion requires curiosity. If a young woman or girl is binding, dissociating from her body, rejecting her sex, pursuing irreversible medicalisation et cetera, then adults owe her and every other girl that comes after her more than a virtuous slogan. ‘Listen to trans voices instead’ is not enough if the only voices deemed acceptable are those that affirm the approved conclusion. Because whether you like it or not, detransitioners are voices too. So are women who once believed transition would save them and later concluded that it did not. So are women who can now see that their dysphoria was bound up with trauma, misogyny, homophobia, autism, or sexual shame.
Not even trans-identified people can universally agree upon what makes one trans. There are trans-medicalists who believe gender dysphoria and subsequent full medicalisation (cross-sex hormones, surgery) is a requirement to being trans... whilst there are also genderists who believe you don’t need gender dysphoria to be trans, and that self-ID is valid, paramount and beyond scrutiny.
People are individuals, yes. Which is precisely why ‘they exist simply because they do’ is inadequate and unhelpful. Individuals have histories. They have bodies. They have incentives, wounds, fantasies, fears, loyalties, compulsions, social environments... Pretending otherwise does not protect them.