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Fully agree except that Italy’s CFR is most likely caused by its large proportion of elderly people. Compare to South Korea where the majority of infected are young and thus CFR is sub 1%.

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The difference in age demographics isn't nearly enough to account for the differences in outcomes, unless you believe the proportion of people in Italy >70 years old is 5-10x that of South Korea. (Spoiler alert: it's not).

The issue has to do with preparedness and healthcare capacity. South Korea has 3x the number of hospital beds per capita than Italy.

Japan has an even more elderly population than Italy, yet a lower CFR than South Korea. Is Japan testing enough? Are they somehow self-isolating way better than anyone else?

Japan didn't really test much. Lots of elderly die alone even without virus, people used to it.

Japan isn't really doing much and many suspect that they are deliberately looking away from the coronavirus outbreak because of the 2020 Olympics later this year. IMO, the gov't willful neglect and concealment is exactly what enabled the coronavirus outbreak in Wuhan, China and I fear this might come back to bite them later.

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