I used to read a lot of LessWrong, Yudkowsky, SlateStarCodex. Rationalism is really just another religion, with the faith parts carefully tucked away underneath concepts like priors or how one chooses to construct a model or assign/“update” probabilities. Their god is ASI. Their beliefs have no more fundamental basis in truth than any other faith.

There’s also a fundamental problem with the idea of using models and probabilities for decision making in that one has to choose a model before deducing any facts, and this leads to all sorts of post hoc rationalization. It’s basically just a culture of people with weird preferences coming up with mathy rationalizations for them.