Is a pandemic, like other crises, a terrible thing to waste? For progressives, it looks like a golden opportunity to outlaw Americans’ private health insurance and create a single-payer system of national health insurance for every legal or illegal resident in every nook and cranny of the country. Take it from the irrepressible Rep. Alexandria Ocasio-Cortez, D-N.Y., who says the United States should quickly extend “Medicare/Medicaid coverage to all.” Not a moment to lose.