How could you possibly isolate 10s of millions of people who are thoroughly mixed in with the rest of society? Many of them live with or are dependent on the y

How could you possibly isolate 10s of millions of people who are thoroughly mixed in with the rest of society? Many of them live with or are dependent on the younger healthier people. Even if the isolation were possible, letting the virus spread like that would overwhelm the health system and push the death rate way up.