> Whereas lockdowns in the Covid-19 case might have contributed to a lengthening of the crisis by delaying herd immunity The point of the lockdown was not to entirely stop the spread- that was obviously not happening. It was to slow the spread to avoid overwhelming hospitals. It allowed us to reduce the lethality of COVID-19 by having more resources per sick person.
I assume experts look at a large number of factors to assess whether it should or should not happen and measure the disease by a variety of metrics.
Also I'd assume the urbanization, science, and ability to execute a lockdown changes over 62 years. Also the nature of work is different. Nobody was doing home computer video conferencing in 1958.
If anyone really wanted to compare it, they'd probably need to have some technical expertise in both diseases and also be some kind of specialized historian.