People can't be simply reduced down to a number and happiness isn't an 'x' that we can solve for in a mathematical calculation.
(If I may summarize what you've said) Saying that a large number of coincident deaths causes a collective grief that wouldn't have happened otherwise is rather subjective. I have felt nothing of the sort. I don't think it's enough of a concern to justify such an overreach of government power.
Quantifying the value of life as a number is icky but necessary if you're making decisions of this scale.
You can do it - although you can't calculate happiness completely, you can make models and reason about it in a mathematical/economic way. How much you believe the theory maps onto the real world is a valid criticism, however there are entire sections of the social sciences that attempt to do this to help inform policy and decisions (see: Happiness Economics - https://en.wikipedia.org/wiki/Happiness_economics).
In fact, the concept of a quality-adjusted life year (QALY) is a very common healthcare economics concept which is used in the UK (NICE) to decide how to allocate drug funding and direct policy.
1 out of 695 people have dies from covid in Sweden since the start of the pandemic [0], two thirds of them over 80 years old, 96% over 60 [1]. I would not call that mass death.
> People can't be simply reduced down to a number and happiness isn't an 'x' that we can solve for in a mathematical calculation.
I don't have a problem doing that for myself. I have a limited amount of time left in this world and some of the things I most enjoy are impossible to do with the restrictions that have been imposed over the last 18 months. Last I checked, before vaccines, was that I had a 1 in 15,000 chance of dying from covid. I personally don't think that's reason for me to curtail living my life. The numbers look even worse for younger people and those who have had more of their lives upended by lockdowns.
These are population decisions, involving millions of people, people dying all the time, suffering one way or the other. Lockdowns have costs and downsides, too. If you are not using math to look at this then what are you doing?
[0] https://www.worldometers.info/coronavirus/
[1] https://www.statista.com/statistics/1107913/number-of-corona...
And on the side of not having lockdowns you'll find things that are much worse than some assumed percentage loss of happiness: people dying in total isolation despite not being sick, people dying of medical care that was withheld because they were too afraid to go to the hospital, a generation whose growth was stunted by lack of education and simple lack of human contact (according to one study, babies during the pandemic had a 22% lower IQ than babies from other years [1]), etc. We have done incredible damage to ourselves.
At the beginning of the pandemic this was justified, since we didn't know if this was going to be a mild case of the sniffles or some kind of air-transmissible ebola. Once we knew it was much closer to the first than to the second, however, we should have adjusted our policies, and we never did. I'm terrified that in the coming months we might see a return to lockdowns, as cases will inevitably rise again, and our politicians know only one answer.
I know an elderly couple that literally hasn't left their house, nor received any visitors other than for things like grocery deliveries, since the beginning of the pandemic. Considering how terrified they now are of the outside world, they will live out their lives in a self-chosen prison cell. They are both fully vaccinated (doctor came to their house for it), but refuse to step outside. Is that life?
As another poster here put it so eloquently: life shouldn't be treated as nothing other than a transmission vector for the virus.
How would you feel about a government policy where people are killed two years before their estimated 'normal' date of death, in order to spare society the massive medical cost of the last few years of living? Evil, right?
How do you feel about a policy where those two years are also taken by the government, but in the middle of your life? Sure, we weren't actually killed; we were allowed to keep producing. The only thing that was taken from us were all the things that made life worth living...
[1] https://www.theguardian.com/world/2021/aug/12/children-born-...