Photo by Evan Vucci/AP

Marking an unholy milestone, the COVID death toll in the US topped 500,000 Monday afternoon – specifically, 500,054, though by the time Joe Biden addressed the nation in the evening to mourn and remember “each person and the life they lived,” the tally he recited from a card he carries daily in his pocket was up to 500, 071. The Washington Post offered some visual aids to help Americans envision the staggering number: It would take a nearly 100-mile caravan of buses to carry that many bodies, or the Vietnam Memorial would have to be a wall 87 feet high to honor them, or Arlington National Cemetery would have to be doubled to bury them. In a brief, poignant ceremony, Biden acknowledged the “truly grim,…