CDC recommends them, RKI also while there are still some people who raise doubts, people who are wearing either pseudo-masks or face shields.
So here is another argument by the most contagious airborne disease – measles has a secondary attack rate of >90%. Using masks should have reduced the incidence. And it did – as shown by a recent eurosurveillance.org paper
This is fully backed by live European data http://atlas.ecdc.europa.eu