I don't enjoy saying it but and I hope it isn't true but:

Immunocompromised Folks May Not Produce COVID Antibodies, Even With A vaccine

"However, for the approximately 4.3% of the adult population who are immunocompromised, they can still be infected with COVID-19 even after vaccination. They can’t risk easing up on their precautions. For these vulnerable individuals, the COVID vaccine won’t protect them — and their bodies do not even produce COVID antibodies in many cases — even after vaccination. Instead, they rely on all the people around them who can be protected by the vaccine to actually get the vaccine."

Well now that explains the pressure tactics and the shaming tactics being used around the world to push Mass vaccinations.