This seems like an awfully uncharitable and cherry-picked treatment of a community of well-intentioned and occasionally eccentric disagreeable online nerds. You're effectively just noticing that a community that actively aims to overcome bias is not free from bias itself, but no one within that community would ever deny that.
It's not the bias the problem, it's the conviction of being better and "less wrong" than the rest of us.
That, along with constantly calling yourself rational and being well-intentioned, easily leads to cultish beliefs to be pursued despite how wacky they seem at their face, because it was your superior brains that led you to them.
If we add the often good (or enormous) financial resources, it makes for a seriously dangerous cult.
I think the issue with the community is they take their eccentric beliefs as being gospel truths which can lead to truly unhinged and irrational beliefs and actions (see: the Zizians).
That's what can make the rationalist movement feel more like a religious cult and less like a bunch of eccentrics. As an outsider looking in, it seems like the entire movement is filled with just accepting priors with very little evidence for why those priors should be accepted.
It's not just that they aren't free of bias. They appear to incubate truly wacky stuff - Leverage Research [1], the Zizians, all the AI/x-risk stuff. I am not the only person to have noticed this [2]. There's something about their approach that appears to actually make people more susceptible to nonsense, not less.
[1] https://lydialaurenson.substack.com/p/the-inside-story-of-le...
[2] https://asteriskmag.com/issues/11/why-are-there-so-many-rati...
The people who sincerely believe that humans should be turned into mulch for the Computer God are “well meaning”? Say more
> online nerds
you are heavily downplaying the power and influence some of these people have. Sam Bankman-Fried is one of these people, for example