If diet related illnesses were unknown before COVID they'd have had an even more dramatic impact on those numbers.
We've not only decided that's an "acceptable steady state", but actively embraced it.
> Life expectancy in the US dropped by a year in 2020.
In other words: it dropped around 1/10th as much as the difference between today and 1970.
Do you think the average person in 1970 would have accepted 10x the invasiveness of the measures we've had for the last couple of years to reach parity, or were they just used to the "normal"?
You can argue that we should or shouldn't do something, but claiming that human beings aren't fine with perpetually dealing with this level of risk is rather absurd.