The article you linked is excellent. We have so many anomalies with SARS-Cov-2. This may explain a few of those anomalies.
Please explain your statement above. The information that I am garnering suggests that herd immunity from SARS-Cov-2 is much lower than 60%. Many people, and even certain demographics seem to be, as communities, somewhat immune to the virus (kids for example). If we add people who have some form of natural immunity, to the people who have gained immunity from some other form of SARS (MERS), and even the common cold, your stated 60% for herd immunity is completely blown out of the water.
Swedes were estimating that herd immunity in Stockholm would be reached at about 35%. I will search their sites to gain information on why they chose 35%.
To iterate, reasonably healthy young people who are active and fit, have relatively little to fear from SARS-Cov-2. The sky is not falling; the data is rolling in everyday. Lock down the weak, lock down the morbidly obese, and lock down people of all ages who have comorbidities and allow the healthy amongst us to fight this virus.
To date, we don't have vaccines for common colds or Corona viruses for a reason. You may be waiting for decades for an effective vaccine that does not have dangerous side affects. All countries must open their borders and allow measured communication so that countries with limited health care can cope with any outbreaks. Even Indonesia.
Wishing for this virus to go away by hiding from it will never work. Keeping the world closed down will only kill more people from economic related issues. Failing economies are deadly. Wealth is not created by printing it.
cheers,
m²V2