Speaking for myself, I am not much worried about myself, as a vaccinated person, catching COVID from an unmasked person. But (as I’ve tried to explain to you on other threads) I am concerned about maskless unvaccinated people infecting each other, or other masked unvaccinated people, both for the sake of those specific people, and everyone else they might infect, but also because I understand large-scale cause and effect. The more cases there are and the longer the disease continues to propagate, the greater the chance that it will mutate into a COVID-21 or COVID-22, which may be COVID-19-vaccine-resistant and/or possibly even more virulant and/or deadly. So (in areas where there is still a significant proportion of unvaccinated people infected (e.g. the USA)) the more unvaccinated people wear masks, isolate and keep their distance, and the more careful they are, the faster the disease will be eradicated and the less opportunity it will have to mutate, which could make the difference between whether we end up having another pandemic right away or not.