[Bodhi]

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Take the belief that the world didn't just pop into existence two and a half seconds ago, dinosaur fossils and all, with all your previous memories intact (faked, like the dinosaur fossils).

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You don't mean to say that avoiding radical skepticism is the main reason to suppose that there must be foundational beliefs, do you?

As I see it, my belief that the world is not fake, not created two seconds ago, is justified by other beliefs, e.g. that I'm not hallucinating; it's daylight out (standard observing conditions), I can see just fine, and I haven't noticed any objects popping in and out of existence, etc. In turn, these beliefs should be justified by other beliefs, with no end to the chain.

The idea of foundational beliefs may make sense working backwards philosophically, but for the story cognition and language I find it very problematic.