When it comes to people who aren’t trans, the typical motivations for immersion in transactivism’s foundational fictions seem of four main sorts. First, there’s a desire to be kind to trans people, without a lot of further thought about what that might look like. Second, there’s wanting to seem kind because of the social capital it brings you these days. Third, there’s a desire to avoid ostracisation, since you know you will be socially punished if you don’t. And fourth, there’s a desire to undo human sexed categories with the power of words, because you heard from some whackjob academic that this was a coherent and politically desirable thing to aim for.
That definition sounds spot on from what I've seen. I work in a university, so am exposed to a higher rate of this than most, but the people I know who have bought into the trans agenda are generally young, naive, but basically kindly. Some are desperate to be liked, and can be quite shocked to discover that not everyone agrees with them, and that the disagree-ers are generally decent people too. They clearly expected to find that 'good' people would be supportive of the trans agenda, and that cynics would be 'unkind', although they struggle to define those terms, too. There is a set of learned responses that they trot out if questioned - it's as though they have all read the same paper, or all attended the same brainwashing sessions:
* Transpeople are the most marginalised group in society.
* People who criticise TRAs would have been homophobic if they'd been around in the past (or if they are older, they must have been homophobic as younger people).
* Nothing is being taken from so-called 'cis' people if transpeople get the things they want.
* There should be no debate, as debating suggests that there is another side to the argument.
All of these things are clearly nonsense, and they have no comeback when pressed to defend them beyond a simple 'trotting out' of the cliches. They can never, ever, define the terms 'woman' or 'man', and insist that transpeople 'just know' that they are one or the other, and that saying it makes it so - TWAW, and that's all there is to it. It's like a cult.