I doubt that all masks are worthless in stopping COVID-19. It depends on things such as how its worn, how many times its been used, and the materials its made of. Masks shouldn't be mandatory on a national level, nor at the level that some states have pushed for it to be. Not all masks are of equally high quality overall. @Aryanne
While Coronavirus is by no means a blessing, its likely not quite as bad as Ebola, HIV, Herpes, Zika, or even the antibiotic-resistant strains of Staph bacteria.