The secondary goal was preventing transmission and contracting the disease
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That failed spectacularly
Blocking 94% of asymptomatic infection and 97% of symptomatic infection is pretty darn good.
I saw somewhere (haven’t verified the source) that there have been 125,00 breakthrough infections in the US. That’s out of 165 million fully vaccinated Americans. That means no infection in 99.925% of vaccinated persons.
The Delta variant complicates things for both the vaccines and those who were previously infected, but those people are still not having any significant issues with severe illness.