Here; an excerpt:

Had American leaders taken the decisive, early measures that several other nations took when they had exactly the same information the U.S. did, at exactly the same time in their experience of the novel coronavirus, how many of these Covid-19 deaths could have been prevented?

That isn’t a hypothetical question. And the answer that emerges from a direct comparison of the fatalities in and policies of the U.S. and other countries — South Korea, Australia, Germany, and Singapore — indicates that between 70% and 99% of the Americans who died from this pandemic might have been saved by measures demonstrated by others to have been feasible.

Certainly if there had been adequate testing available, the incidence of asymptomtic staff infecting residents in nursing homes and assisted living facilities would have been far less frequent.