"That's why governments will likely not do it."
Japan did it. Japan learned from the docking of the Princess cruise there and the results from each passenger. Those results were quite interesting.
And death rates by age group are revealing. The young without co-morbidities have great prospects.
September Tokyo study said,
"Boston Children’s Hospital and Beth Israel Deaconess Medical School, Boston, say their study suggests that seroprevalence for SARS-CoV-2 rose to almost 50% ..."
https://www.news-medical.net/news/20200924/Tokyo-citizens-ma...
These are mainstream medical professionals from USA making findings that Tokyo is at herd immunity.