No actually required :-). I didn't say masks were not effective, I said part of their effectiveness is the making-conscious of transmission vectors. E.g. when you wear a mask and see others do it you are more likely to wash your hands or stand back.
When you wear a mask (as I do) in addition to blocking some particles you signal to others "lets play the not kill eachother game by limiting virus vectors!"
When you wear a mask (as I do) in addition to blocking some particles you signal to others "lets play the not kill eachother game by limiting virus vectors!"