I can understand being "invested" in religious beliefs, since an entire after-life may seem dependent on such belief. But it's not just religion I'm talking about.
Think about Cargo cults of the Pacific, they are quasi-religious, but don't promise eternal happiness. Just lots of goodies in the present.
Or the election deniers, all this time after the 2020 election which happened nearly 2 years ago now. More than 60 court cases, legislatures setting up investigations -- and yet nobody has produced anything even remotely approaching evidence of fraud that could have accomplished what they claim. Yet the continue to claim it. Why?
What does QAnon believe? The core QAnon theory is that a cabal of Satanic, cannibalistic sexual abusers of children operating a global child sex trafficking ring conspired against former U.S. President Donald Trump during his term in office. Also that while in office, Trump and his team were secretly fighting the cabal. QAnon was actually an offshoot of Pizzagate, which believed that high-profile Democrats were sexually abusing children at a pizza shop in Washington. One believe even staged an armed raid on the shop.
But, surely, any thinking person would realize that if so many children were being abused by Democrats -- there would be children who, as with various churches, stood up and said, "I was abused -- the Senator (or the priest) did things to me that he shouldn't have." Where are they?
I can understand, to a degree, supernatural beliefs for what one does not know how to explain naturally (which is why, by the way, such beliefs tend to fall off with higher STEM education). Since there are humans, I can sort of understand why many might accept the idea of the creation of Adam and Eve, or other such myths.
But for beliefs such as the above, a person with an IQ larger than their neck size should be able to see that no evidence at all, no matter how diligent the search, is very likely to mean that the belief is not well-founded.