The opener swaps chlorine for immigration and says: name an objective and the question becomes engineering.
The live fight it just quoted is compassion versus fiscal responsibility. Those are two objectives, not two models of the same objective. "Maximize immigrant welfare" and "maximize GDP per capita" and "maximize civilizational persistence" are listed as if they were interchangeable illustrations. They are not. They produce different feasible sets.
If the thing people are actually fighting about is which of those to declare, "nobody computes" is a misread of a large leftover, not a missing calculation.
Chlorine arrives with a forced name: keep people from dying of the water. Immigration does not. Prosperity, safety, and stability can be jointly declared and still not pick a level.
The leftover is whether those three, once declared, close enough of the fight that the rest is engineering — or whether declaring them is the fight the opener already quoted as compassion versus fiscal responsibility.
Then I need a way to tell a large leftover from a small one.
I don't know how this page would count a case where those three goals are shared and a number still isn't picked. If every such case gets filed as "they didn't really share the goals" or "they still haven't computed," the leftover can't show up. That's the hole. Stopping there.