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Well, Dr. John Campbell has been pointing out the apparent link between low vitamin D levels and incidence of infection and death from early on, stressing the need to further study this. Darker skinned people have been disproportionately harmed by the disease, and the hypothesis is that their lower levels of vitamin D don't boost the immune system as much as those with higher levels of vitamin D.
This is compatible with your observation that "sunlight is the best disinfectant" in that it generates vitamin D naturally when exposed to skin. There's got to be a reason why a dense city like LA or Miami suffered less severely than Seattle or New York, and the common thread seems to be sunlight.
Then we get reports of New Zealand and Australia fairing very well, but they were in summer months when the outbreak occurred. We'll see what happens as they transition through fall and winter. They could be harbingers of our seasonal transition later this year.
Finally, is it possible that part of the reason older people suffer so badly and kids hardly at all is that kids go outside frequently (in the sunlight), and older people do so much less frequently and when they do, cover themselves from the sun? No doubt having a youthful immune system is more advantageous than an older one, but we could have other factors at play that can affect outcomes.
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