Surely, where health and safety are involved, better to be cautious than cavalier. Following the science means just that. If things turn out to be a nothingburger. Great. But the issue in the USA from the beginning is that we've been trying to catch up.
We're also seeing now that the virus is mutating. I recall reading that at least one person has been confirmed to have contracted the virus twice. Herd immunity may not be possible, much as there is no herd immunity to the Flu.
Lastly, there are a lot of folks out there who are taking drugs that may be doing more harm than good (e.g., hydrochloriquine), taking snake oil products that are almost certainly doing more harm than good (e.g., colloidal silver), and just plain doing very dumb things (e.g., gargling or even drinking bleach). The issues with the science aren't issues with science. It's entirely to do with learning more about this particular virus. The epidemiologists know what they're doing. They have dealt with other pandemics, such as SARS. And we can see in those countries where they did follow the science, the work has paid off. In other words, what we're going through now is entirely predictable.
Edit to add: I recently read an article stating that the virus has already mutated into one that appears to be less deadly but more contagious. I'll post a link, if I can find it again.