As somebody who was a part of that rationalist movement for so long and still hang around the various fringes, this hurts.
One of the issues with rationalism in the extreme is it can lead to some crazy outcomes. For example take Pareto's principal.
Pareto says that since the reward of believing in Jesus is eternal life and you will die if you are wrong anyway than the rational choice is Christianity.
This is technically true. We are taking millions or I finite years and so what gamblers call the expected value is going to be more positive by believing.
Its these same sorts of calculations with rationalism. Pareto's mugging is where a mugger walks up to pareto and instead of putting a gun to his head, he says give me everything in your wallet and I will come back and hand you 20 million dollars tomorrow.
Let's say he has $10 in his wallet. You could calculate the EV of the decision to give it up at $11, which would make the correct move handing over everything in your wallet.
These rationalists would in theory be okay with nuking Germany if there was a 0.01% chance that a man in Germany in a lab would destroy the world by creating a deadly virus. Over an extended time frame nuking Germany could save billions of lives at only the cost of about 20 million lives.
These rationalists have done things like start a cult in silicon valley to willingly submit to brainwashing on the off chance it helps save the world. The rationalist community has a high barrier of entry, intellectually anyway so these are very smart people.
You also have Sam Bankman Fried who used the same rationalization to steal billions while simultaneously living like a scrub.
It's not all bad of course but the community's ideology and they don't realize this is an ideology that has led to Marxism and killing hundreds of millions of people in the name of Marxism to create a perfect society. It's also what led to the eugenics movement championed by Nazis.
These types of calculations are not good for society and we need to seek a higher truth. One that supercedes logic. Removing this in favor of using your ability to reason as some sort of God like thing has caused the greatest catastrophies in our history