That was what they tried at first in the UK, just isolating high risk individuals. But people that were caring for these high risk individuals were getting corona and didn't know because they were asymptomatic, so they were spreading it to the high risk population. Now they risk having their medical facilities overloaded, causing people to die from lack of resources. The proposal to only isolate the vulnerable would be workable if either 1) you weren't contagious unless you were showing symptoms so easy to identify as a carrier, 2) there was a vaccine that caretakers could take, or 3) there was a test that was readily available, accurate and quick enough that someone could take it every morning before starting work.
Not an apples to apples comparison. They attempted herd immunity with no restrictions. We have restrictions, now. Half the deaths in the UK recently were over age 85. Over 70% of those that have passed in the UK, were significantly overweight. You're never going to get the number to 0. All we've done is kick the can.
I really hope any of you that fall into the vulnerable demographic will do your best to lose weight and keep moving. We need you guys around for a long time!