They never had herd immunity in the first place. The vaccines do not confer immunity. They only provide some protection from severe disease and death. The vaccinated still carry and spread Covid. Worse, they will push mutations and more dangerous variants will pop up. It only takes some mutation in the spike protein to defeat the vaccines.  You're quite right about herd stupidity, because the herd believes all the BS that the way out of the pandemic is with the current vaccines.