I think this dichotomy (prevents vs doesn't prevent) is false. Vaccination reduces the likelihood of getting infected and it reduces the likelihood of severe illness. Perhaps not to the same degree, but my point here is that it's not black & white as the quoted wording implies.
It may increase it by selecting the un-protected strains.
> it doesn't prevent infection or transmission
Source? We’ve (largely) vaccinated our way out of other diseases. I haven’t heard of any outbreaks of mild measles or mild rubella and I suspect it’s because vaccination gets the R lower.
https://www.businessinsider.com/delta-variant-made-herd-immu...
If we end up with measles2 and rubella2, I wouldn’t be surprised if my measles1 and rubella1 vaccines weren’t effective.
Covid-zero is impossible in any open society. China is still pursuing a covid-zero policy, but even with locking down entire cities and imposing travel bans they're far from zero.