Interesting. Just looked into it and it seems like there are some researchers who estimate the lockdowns saved a lot of lives, but the economic toll and subsequent deaths from this toll may not have been worth it (as you mentioned). But they also said that now, "we have more tools to battle the virus. Vaccines and therapeutics are available, as are other mitigation measures." Implying we wouldn't have to do lockdowns in future pandemics.

https://record.umich.edu/articles/lockdowns-saved-lives-but-...

So yeah, I do see your point in the lockdowns were probably unnecessary, but as others have mentioned, pandemics were new to the US at the time, and we didn't have the knowledge and procedures on how to best deal with it. Yeah, we did probably go overboard, but what happened is understandable given how deadly Covid was.

We know now that social distancing and masks (for those that are willing) would probably have been enough, as other countries used to pandemics already know, like South Korea.