It's ethically vile, and deserves nothing but spit.
That anyone will die should be reason enough to slow down and do the right thing. Covid-19 has revealed how thin some margins are for businesses we need to survive. Condemning the sick to die and going back to normal isn't just cruel and evil - it's shortsighted and foolish.
We need to change.
But my reasoning is that "condemning thousands of people to die" is the wrong way to look at it. You can look at it as "saving a million lives". Hell, by making driving legal "we are condemning 35,000 people to die every year". At a certain point, certain tradeoffs become reasonable.
https://www.npr.org/2020/04/15/835571843/episode-991-lives-v...
So even by the standard of the argument you are making, it makes dollars and sense to lock down.
Herd immunity without a vaccine is condemning thousands of people to die.