[xyzzy123]

There's also a social tipping point sort of thing that happens, and fines help with that.

When hardly anyone is wearing a mask you feel a bit weird or silly.

When half the people are wearing masks you look at the people who are and aren't and can't help but wonder which side is your in-group.

When fines are enforced, everyone has an "excuse" to wear a mask. Darn fines.

Then, when everyone is wearing a mask you feel naked if you don't have one. Only the seriously anti-social will defect.