R-factor. If 90%* wear masks and the R-factor of the "flu" is is low enough it "disappears". But if the R-factor for covid is high enough it still spreads even

R-factor. If 90%* wear masks and the R-factor of the "flu" is is low enough it "disappears". But if the R-factor for covid is high enough it still spreads even if 90%* wear masks (10% don't). It's mindboggling how simple simple thinking can evade people. *numbers made up for illustration purposes only