What an interesting parallel between the polio and the covid! At least, today, we have (slightly) more ethics when dealing with medical tests :)
I have a couple of extra comments:
One source, writing in Science Alert ("Here's Why Herd Immunity Won't Save Us From The COVID-19 Pandemic", March 2020) estimates that herd immunity for COVID-19 will be achieved when 70% of the population is vaccinated.
That’s weird. As far as I know, it is not even sure herd immunity could be reached at all.
This notice was placed in the window of homes where someone had been diagnosed with polio. All who lived there were in mandatory 'lockdown', on pain of fine and//or imprisonment. It is assumed this image is credited to a government agency, but in any case the picture is in the public domain.
This is maybe how COVID lockdowns should have been managed: testing everything and locking down only those who contracted the disease? This is at leat how I would have handled things, giving the country the means to do those massive tests (like in Korea I think).