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Even in the case of the delta variant vaccinated people who get infected are more likely to have reduced symptoms (if they have any noticeable symptoms at all). That means a lot less coughing up huge plumes of virus over great distances. Nothing is perfect, but in the end the vaccines increase your odds of not being infected while decreasing your odds of spreading the virus. Herd immunity may not be reached but we can drastically reduce deaths and serious illness. That's already a win for vaccines.