A huge proportion of ICU cases have obesity as the dominant risk factor, INCLUDING COVID.
And the costs of treating obesity related illnesses, like many heart disease, cancer and diabetes cases, are enormous, and dwarf the costs relating to COVID.
Even in COVID's first year in the human population, when it spread like wildfire, heart disease and cancer killed far more people, and obesity is a contributing factor in a significant fraction of cases of these illnesses, particularly heart disease.
>>as herd immunity is not required to make a nonzero positive impact
Without herd immunity, the virus continues to circulate, until every one has contracted it. After they have contracted a COVID infection, they acquire far stronger immunity than provided by vaccination.