There's a reason the efficacy rates, even from those early, astonishingly good clinical trial results, were, like, 94%. Note that 94% is not 100%!https://twitter.com/kingdomofwench/status/1417192916389441540 …
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vaccination means if you ARE exposed you're way more likely to fight it off without developing symptoms or becoming contagious, and even if you do become contagious you'll probably be LESS contagious, and for less time; and if you do develop symptoms they'll probably be less bad.
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enough people doing those things (ideally being required to do those things!) consistently enough—this is the societal part!—means the virus can't spread through the population very effectively, which comes back around to reduce that initial chance of exposure.
