Vitamin D levels have plummeted in the population over the last decades.
Why? because people "did what they were told" by the health authorities: they adopted a low-fat high-carb diet, avoided animal foods (especially meat, fat, and eggs), and stayed out of the sun. This advice has created a worldwide disaster of insulin resistance, chronic inflammation, and metabolic disease. The advice was completely wrong and not based on science. But for 50 years it has enriched big agriculture, big food, and big pharma while consigning 100s of millions of people to obesity, crippling disease, failing health and miserable death. And all the while the authorities have been telling the people these health problems are their own fault (just "eat less and move more").
It is not the fault of the victims. These conditions came about because of the guidance of the "health authorities" (government organizations, medical organizations, academic organizations, and the parrots in the media). They have now resulted in a serious death toll from COVID-19 and its knock-on effects.
And yet we are being asked to trust these same organizations when they instruct us on the causes, prognoses, remedies and mitigations for COVID-19?