I think they're crazy first, trans second. They were marginalised for being crazy. Then they found each other because they're trans. Many cults have random attributes shared by the members, whether it be race or sexual preferences. Their race or sexual preference didn't cause them to join a cult, they had other things going on that drove that. But when it came time to join one, they gravitated towards the one that identified with them.
As rachofsunshine suggested, there are quite a few factions and splinter groups within the larger "rationalist" subculture, not just people who happen to be trans and were recruited because of it. My takeaway after spending a few hours down the rabbit hole is that they all seem to be composed of very smart people who have a screw or three loose.
I'm afraid that at some point, some of these people are likely to talk themselves into doing something seriously fucked up. If I worked on AI at OpenAI or Google or Meta, I think I'd prefer to work from home... and if I occupied a visible position on the org chart, I'd hire a damned good private security company to keep an eye on my family.
I think they're crazy first, trans second. They were marginalised for being crazy. Then they found each other because they're trans. Many cults have random attributes shared by the members, whether it be race or sexual preferences. Their race or sexual preference didn't cause them to join a cult, they had other things going on that drove that. But when it came time to join one, they gravitated towards the one that identified with them.