As our country, the USA, seems to be taking up it's traditional battle lines between left and right over how quickly to reopen things, I find it useful to look at situations which cross that divide; such as in Sweden. Sweden, often considered a model of left leaning economics is doing a strategy that is more like the open earlier philosophy that's associated more with the right wing, here in USA. Different from Sweden's other Nordic neighbors.
Who knows what the best strategy is as much of the science is still being found out. The science is evolving; especially when one takes into account what the best long term strategy is, for instance what are the results several years from now. The science becomes more complex when including not just deaths from this virus, but also the consequences of other things in society, such as increased poverty and domestic violence from cabin fever.
On the other hand, maybe society will be better due to a more shut down strategy. We may be learning to develop a society that is less fixated on money and / or being in crowds. That could be a long term argument for putting parts of the economy on hold.