I like the link you shared, thanks. (Though the graph still could have easily trended the way it did for many other reasons)

Here is an interesting paper too -> http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.552... (Co-authored by Donald Henderson who was credited with ridding the world of smallpox) (talks about the pros and mostly cons of lockdowns)

Edit: Just adding a link to a paper that suggests T-Cell immunity from previous beta corona viruses might be helping -> https://www.nature.com/articles/s41586-020-2550-z