“Evolutionary pressure” doesn’t really exist if the virus doesn’t get a chance to replicate. The virus is trying to find a mutation which bypasses the vaccine,

“Evolutionary pressure” doesn’t really exist if the virus doesn’t get a chance to replicate. The virus is trying to find a mutation which bypasses the vaccine, the more chances it gets the better. This is why people talk about animal reservoirs and immunocompromised individuals. The chance of a beneficial mutation occurring increases the more the virus is able to replicate within an organism. It replicates more in unvaccinated organisms.