The excess deaths during the pandemic are not subtle in these graphs. If the data is accurate and the comparison with Sweden is valid, then it does tend to support the importance herd immunity to this virus.
How does this support herd immunity? Herd immunity wouldn’t lead to the distinction between the US and Sweden unless Sweden achieved herd immunity before the virus was being tracked.
Explain what you mean by "herd immunity"? It is normally achieved through vaccination; if you mean "wait until most of the population has had the disease", you'd need to wait until the US death toll was much higher to achieve that.
Here is one for Germany:
https://www.destatis.de/DE/Themen/Querschnitt/Corona/Gesells...