Herd immunity can be achieved with natural immunity + inoculation + therapeutic/chemo prophylaxis. The only time in history where natural immunity has been considered insufficient for the goal of herd immunity is 2020+. WHO went as far as changing their definition of herd immunity last year to exclude natural immunity (check the way back machine).

Leaky vaccines can also cause mutation pressure on viruses, but the only acceptable public position is that the unvaccinated are causing the more virulent strains.

Propaganda from the top down to sell more (in patent) pharmaceutical products, with force and public shame. Think about this for a moment: someone at WHO identified their herd immunity definition on their website and willingly modified it to exclude natural immunity. Ask yourself how that is in any way scientific or appropriate. It is scientific gaslighting and the only explanation is a desire to sell more vaccines.