> The reality is that everyone is prepared to allow others to die for their own convenience.
It may be so. Those people are morally wrong however. This is a deep point that I have insisted on in other comments as well. Casually weighing human life against economic cost is not acceptable in what we might call a civilized society.
> The only difference between believing 70,000 is okay, and 700,000 is not is a gut feeling about how much preventable death is worth it to maintain our living standards.
That is not true. Deaths caused by the regular flu are deeply regrettable and should be prevented as much as possible. If you dig into the data however, you will see that the coronavirus not only kills many more people than the flu, but it also kills people who would otherwise have many more years left to live. Diabetes, a heart condition or age > 65 yrs. shouldn't be death sentences in a modern civilized society.