> I wear a mask in public (because "better safe than sorry")

Saying "better safe than sorry" makes it sound as though you're not sure about this, but this one isn't in doubt - masks reduce the spread of the virus, and that's their primary purpose.

Here's an article about it: https://www.ucsf.edu/news/2020/06/417906/still-confused-abou...

See the section titled "What evidence do we have that wearing a mask is effective in preventing COVID-19?"