You ever see a dog that’s got its leash tangled the long way round a table leg, and it just cannot grasp what the problem is or how to fix it? It can see all the components laid out in front of it, but it’s never going to make the connection.
Obviously some dog breeds are smarter than others, ditto individual dogs - but you get the concept.
Is there an equivalent for humans? What ridiculously simple concept would have aliens facetentacling as they see us stumble around and utterly fail to reason about it?
Everybody else is saying things that some humans are too dumb to grasp. I’ll give you an example that virtually all humans are too dumb to grasp.
How are our decisions affected by conflicts of interests? The last time I looked into this, the research in this area said that humans virtually always underestimate the effect that a conflict of interests has on them, by a lot. Many people don’t even see the conflict of interests. People who recognize the conflict of interests believe that because they are aware of the conflict of interests, they can mitigate the effects completely. They are wrong.
Humans get entangled by conflicts of interests just like dogs get entangled by their leashes. Just like dogs, many times, humans don’t realize that they’re caught. Just like dogs, even if you show a human the problem, they cannot understand. But even worse than dogs getting tangled by their leashes, humans believe they can understand what to do when they’re caught up, but it turns out that they’re wrong.