‘why haven’t the infectious disease experts ever recommend they be worn to prevent all other communicable diseases, like whooping cough, chicken pox, measles, mumps, the common cold, Asian flu, MRSA, Bird Flu, TB, Swine Flu, SARS, etc?’
quite simply, because there are no political and financial incentives to do so...
Yep, none of them were tied to trying to destroy this country, take down a sitting President, and turn our Republic into a third-world commie $hit hole.