And there was a big concern about how to motive people to wear masks when people are selfish and care only about themselves?

Unless I'm behind on the latest science. Last I heard:

Plain cotton masks are effective at catching large droplets that get expelled and spread long distances from your mouth when you talk or breathe. Thus, stay distant and/or wear a mask.

But those masks aren't effective in filtering out tiny particles in the air. Those are still coming in and out. So unless you're getting directly spit on at close range, a cloth mask doesn't do much to protect the wearer.

Again, that is the last I remember hearing.