However, Japan is also destined to default someday. If the interest on Japanese government debt increases only slightly, interest expenses alone will exceed government revenue.

You do understand that Japan, like the US, the UK, Canada, Australia, and many more, cannot technically default on obligations denominated in its own currency unless it does something monumentally stupid like failing to raise a debt ceiling, or imposing one to begin with, right??

Why is it "destined" to default someday? Because you actually think that the "issuer" of a nation's currency plays by the same rules as you as a mere "user" of that currency? Or because you think jumping on the "debt=bad" bandwagon and inciting fear will help you hawk your crypto??

None of your charts or colorful graphs will change the fact that starting from such a fundamental error as not knowing the "debt" represents our net money supply and not a mortgage on our future productivity makes them all moot.