Comment by oneshtein

It's easy: masks helps to avoid infection or/and buys more time for body to fight a virus. Looking at graphs of mortality rate between countries with good mask culture and bad mask culture, it looks like masks reduced Covid19 mortality by 2x at least.

  Country   # of cases   # of deaths
  USA       111,820,082  1,219,487
  UK         24,910,387    232,112
  Japan      33,803,572     74,694
  S. Korea   34,571,873     35,934