I understand, BUT experts have said that most of those masks available to the public are no protection at all because the virus particles are so small they can go through any woven or paper mask. The N95 masks will protect you, but they are only for single use, and if you do not know how to properly put them on and take them off they are not much use at all. I don't think a member of the public can buy them anywhere now anyway; they are all requisitioned for medical professionals, who need them more than we do. As long as there is a shortage, the masks go to medical professionals, which, IMHO is as it should be. They are right there on the front lines and can't distance themselves like we have the option to do.
I believe the medical professionals who say that the best protection for us is to maintain the social distancing and hand washing the professionals are recommending.
PS: The vast majority of those "walking around coughing" don't have covid-19 anyway. There are still the normal colds, flu, etc., and around here at least a lot of people (myself included) have seasonal allergies, especially to juniper, and we cough and sneeze, too.