Probably the biggest refutation of the Great Barrington Declaration's underlying foundations is how hospital systems have still been burdened severely in several countries that have largely vaccinated their 65+/nursing home populations.
This was obvious to anyone following the data on this virus. Half of all coronavirus hospitalizations have been in those <65 in the US this pandemic. You can't simply protect the most vulnerable with this virus. Societal-wide mitigation is necessary to preserve hospital capacity and protect the most vulnerable from community transmission.
This issue is no better illustrated by Michigan right now. 72% of 65+ in Michigan have had at least one dose of the vaccine. 51% of 50-64 have at least one dose. A third of 30-50 year olds. And there is non-vaccine immunity from prior infection. Yet they have more hospitalizations today than even at their peak in the winter surge.
The Great Barrington Declaration rests on a crumbling foundation.