If only many, many thousands of people die due to economic issues, that's still a
huge win over what the virus would have done if left to run through the country at full speed.
Economic problems would've happened anyway. Global supply chains were already in disarray even before March, as China essentially lost two months of manufacturing output, container ships stopped sailing, and the whole chain was pushed into oscillations it'll take a year or more to recover from (affectionately known as the "bullwhip effect"). Airlines and hotels were done the moment the virus landed in Italy - at this point everyone with half a brain started to cancel any trip they could cancel, weeks before governments in Europe got a clue and started locking down their borders.
The only way the government could've saved restaurants, nail salons, et al. from suffering similar fate would be by suppressing all information about the virus and going to full denial mode. Otherwise, the customer base would've mostly evaporated anyway, lockdown or no lockdown, and you'd still have rolling shutdowns as place after place had to be quarantined for 2+ weeks after some employee or customer was found sick. With hotels and restaurants barely surviving on fumes, the pressure on the food supply chain would've been only little worse than it is with these places shut down.
Anyway, it's not like the governments around the world started to shut down their countries because they were bored, and wanted to stir things up. They actually dragged their feet for weeks after people following the evolution of the virus started stocking up, limiting interactions, pushing for WFH and practicing social distancing.