We'll never know because we never tried any alternatives.
And you've clearly not tested any alternatives to being alive,
yet I seriously doubt you find that a persuasive argument to try not being so...
Many of your economic arguments could just as easily make the case that we should have closed our borders far earlier, implemented a much more stringent lockdown, legislated to provide a buffer against personal and business defaults and held the line until such time the virus was effectively defeated; then cracked on rebuilding our economy with the tried and tested approaches which made the new deal and the Marshall plan so successful.
Of course, that is an alternative which a number of antepodean and East Asian countries have tried... Which seems to have been far less damaging than the UK's half baked approach, or the US's confused and inconsistent free-for-all.
It's notable that the countries which have faired best are not those which are richest, or have the most resources, but those where there's a cultural norm of collective responsibility and placing the best interests of your community above narrow self-interest.
Which leads me to ask:
What exactly is it that makes you think that serving the short term interests of individuals is superior to the longer term interests of the community as a whole anyway?
I'm firmly of the opinion that the rise and rise of mindless individualism and short term thinking is a cancer which left unchecked will see humanity's own hubris destroy itself.