Earlier quoted context omitted.
This is basically the Canada problem: we have tough rules for 95% of people, but we exempt 5% from it, so every variant quickly ends up here uncontrollably anyway. Windsor Ontario has something like 1000+ health care workers commuting to the Detroit area that have been exempt from most entry test/vaccination/quarantine requirements. Same for truckers and flight crews and ~30 other groups. I think this is only changin…
A vaccination requirement wouldn't do anything to control the spread of every new variant. The primary benefit of vaccination is preventing severe symptoms; it doesn't prevent infection or transmission. 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.
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.