60% is what scientists say...maybe you don’t understand the concept.
Are they the same scientists that tells us the world is going to end 10.34 years from Glowbul Warming? Cooling? Climate Change? or whatever they are calling it today?
Scientists have been wrong, many many many times
Are these the same scientists who predicted millions dead in the US alone?
Herd immunity is a function of how contagious the virus is, or the R0 number. It is not a fixed number.
For diphtheria, which has an R0 of 6 or 7, herd immunity is reached when 83-86% of the population is immune. For measles, in which the R0 is between 12 and 18, herd immunity is reached when 92-95% of the population is immune.
In the case of Covid-19, if it is really as contagious as some of these recent reports claim, then its R0 value is higher than that of measles, and greater than 95% population immunity would be needed to contain it. In other words, just about everyone has to catch it before herd immunity would kick in.
Oh, I'm a scientist. I have worked in this field for large chunks of my career.