>Knowing that the vaccine doesn't prevent the person from getting and spreading covid.
Vaccines reduce the risk of spreading the virus. People who are vaccinated are less likely to get seriously ill. This absolutely doesn't mean you won't die if you are vaccinated. Think seat belts in car accidents. It is all about reducing risk. On mass, at population levels, this means ICU have capacity to take in other seriously ill people. If ICUs are full and there is a plane crash or whatever where many people are seriously injured we are screwed.
People who get vaccinated are less likely to get seriously ill. Seriously ill people withdraw from society. Those with mild illness continue to go out into society and increasing the spread.
You could make the point that increasing the spread when everyone is protected is fine but that allows for increased mutations.
Vaccines reduce the risk of spreading the virus. People who are vaccinated are less likely to get seriously ill. This absolutely doesn't mean you won't die if you are vaccinated. Think seat belts in car accidents. It is all about reducing risk. On mass, at population levels, this means ICU have capacity to take in other seriously ill people. If ICUs are full and there is a plane crash or whatever where many people are seriously injured we are screwed.