I don't understand VDBossche's assertions - he seems to say that there isn't a single case of population level benefit from vaccination campaigns. But we have s

I don't understand VDBossche's assertions - he seems to say that there isn't a single case of population level benefit from vaccination campaigns. But we have seen massive benefit from mass vaccination against Polio, Smallpox, Measles, Mumps, Diptheria and many more. This is on a par with arguing that gravity doesn't make things fall down. It's worth noting that Delta appears to have emerged in India when and where there was very little vaccination - on the other hand there were a truck load of infections. This is how mutations happen; many cases occur... a mutation may appear and if we are unlucky it may spread. The key part for me is the "many cases occur" part - if the pandemic is brought undercontrol in the sense of few cases happening then there will be less mutations.