Stuff evolves randomly. Mutations don't survive long enough to thrive because the original variation just drowns out the mutation. Until there is some kind new environment that favors a mutation, those mutations don't thrive. Vaccinated people are like the increased concentration of antibiotic. It is the vaccinated who provide evolutionary pressure.
"Well if the whole world gets vaccinated there will be nowhere for it to thrive."
A) it's not possible to sterilize the world of any kind of pathogen.
B) did you forget that coronavirus came from bats?
http://youtu.be/plVk4NVIUh8
Stuff evolves randomly. Mutations don't survive long enough to thrive because the original variation just drowns out the mutation. Until there is some kind new environment that favors a mutation, those mutations don't thrive. Vaccinated people are like the increased concentration of antibiotic. It is the vaccinated who provide evolutionary pressure.
"Well if the whole world gets vaccinated there will be nowhere for it to thrive."
A) it's not possible to sterilize the world of any kind of pathogen.
B) did you forget that coronavirus came from bats?