Disagree. They just believe what they believe for “non-rational” reasons. Often social or emotional reasons that they aren’t explicitly aware of. We all do this.
It doesn’t make them incapable of reason.
Fundamentally I don’t believe that a large proportion of humanity is “stupid.” I think that’s pretty narcissistic.
And this attitude often seeps into the continuously fact quoting method. Which basically makes the whole thing a non starter