WelwynWitch, this is taken from the WHO site.
Attempts to reach ‘herd immunity’ through exposing people to a virus are scientifically problematic and unethical. Letting COVID-19 spread through populations, of any age or health status will lead to unnecessary infections, suffering and death
If I read this correctly, herd immunity is not a simple process. Where did you get your information from? I am genuinely interested.
I also read achieving herd immunity varies with different diseases and no-one knows accurately many people need to be vaccinated to achieve Covid herd immunity.
As for being treated by non mask wearing paramedics, as someone who is severely immunocompromised, I am very concerned
to read your post.