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It's not only old people, but it's mostly old people and people with severe comorbidities.You realize that you're speaking of a majority of the population, right? 1 in 3 Americans are prediabetic. Nearly half of Americans suffer from heart disease.
> the world is rarely ideal
That's a platitude.
Also given we do talk about the real world, we also have to consider that a country's first priority is towards saving its own citizens. Not ideal, but a fact, driven by those who vote and pay taxes. Nobody is going to allow the death of their own citizens in order to save people living on another continent.
People bring the starving children of Africa into the discussion without actually caring or doing anything about those children.
> If two people need a lung transplant and we only have one, what do we do?
False analogy. Medical triage is at some point necessary, but that's not what we are talking about.
But I'm glad that you brought this point up, because young people that need oxygen or ventilators will die if they don't receive it.