The vaccine won't be 100% effective. The FDA just approves vaccines that are at least 50% effective, and with the margin of error it's possible that they will work in 30% of the population.
The vaccine is still good at preventing you from catching it at all. If you don't catch it you don't spread it. It's more like 50% effective than 99%, but it's still going to reduce the chance you give it to anyone substantially.
I don't think it's black and white. The vaccines aren't 100% effective (and yes, I know this applies both for the kids who can spread it and those at risk who can receive).
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