It's a thought that occurred to me. Opinions are welcome.

Some explanatory footnotes:

"Four-year old" is just a focal example. Consider anyone, young, your own age, or old (these are the three ages of man) with whom you think there is a large conceptual distance to cross. Blues will be thinking of Greens and vice versa, but that's nothing on the scale of what I'm trying to point to. But very young children are a real example, not merely a parable.

When you are face to face with a stranger, you are looking at an alien AI. Their fundamental mechanism of discerning truth from falsity may be just as acute as yours, but is operating on completely different data. And it is the same for them, face to face with you.

There is more context for that thought, but that will do for now.