The people who argue for mandatory masking know this and don't care, they are well past the point where holding self contradictory viewpoints is a problem for them.

Send them a study that shows that 10 out of 10 government officials and media outlets say they won't catch COVID if they take their mask off for 5 minutes to let their bare faces feel sunlight and MAYBE they'll listen, but they're probably so used to hiding in shame that they can't bring themselves to do even that.