> What are the proof of that. It looks like he was like those usual rationalists who come up with obvious theories that a lot of people have come up with and think they are super clever, when they are not.
Anyone who identifies as a rationalist is immediately suspect. The name itself is a bad joke. "Ah yes, let me name my philosophy 'obviously correctism'."
In theory, the name is supposed to imply that they're pursuing rational thinking and philosophies, not that their decisions are the rational choice.
That said, I was surrounded by rationalists in my younger years by pure coincidence and spent some time following the blog links they sent and later reading the occasional LessWrong thread or SSC comment section that they were discussing each day in chat.
It's pretty easy to see that the movement attracts a lot of people who have made up their minds but use rationalisim as a way to build a scaffold underneath their pre-determined beliefs in a way that sounds correct. The blogs and forums celebrate writing of a certain style that feels correct and truthy. Anyone who learns how to write in that style can get their ideas accepted as fact in rationalist communities by writing that way. You can find examples throughout history where even the heroes of the rationalist movement have written illogical things, but they've done it in the correct way that makes it appear to be "first principals" thinking with a "steelmanning" of the other side along with appropriate prose to sound correct to rationalists.
Or naming your cult “The Reasonabilists”
https://parksandrecreation.fandom.com/wiki/The_Reasonabilist...
Well, I agree but think it is even worse than this. Anyone who hasn't got wind of the opposition between rationalism and empiricism is squarely placing themselves in a very ancient thought-space, more Plato than Kant, no Popper, no modernity.
They are basically outing themselves as either having little curiosity, or as having had very limited opportunity to learn... Still if they expound on it, the curiosity deficit is the most likely explanation.
I don't really identify with any particular movement, but it's important to note that there are plenty of people who legitimately oppose the core concept of rationalism, the idea that reason should be held above other approaches to knowledge, this being put aside from other criticisms leveled at the group of people that call themselves rationalists. Apparently, rationalism isn't obviously correct. Unfortunately, I don't really have enough of a background in philosophy to really understand how this follows, but looking at how the world actually works, I don't struggle to believe that most people (certainly many decision makers) don't actually regard rationality as highly as other things, like tradition.