This is a comment I made on Facebook:
It’s much easier to not infect someone else than it is to avoid being infected yourself. Preventing the spread can be done with the cheap, blue surgical masks. Protecting yourself requires a more expensive, and much less comfortable, N95 mask.
It’s now clear that someone who is fully vaccinated can infect others with Delta-Covid. So the obvious thing for everybody to do, including those of us who are vaccinated, is to return to wearing proper masks in public when indoors. The virus doesn’t know politics, it only knows biology, and yet many people insist on making this a political issue.