According to systematic review of 19 different studies, masks do stop the spread of COVID: https://www.sciencedirect.com/science/article/pii/S0020748920301139

Covidiots can even watch a scientifical slow motion video, where LED lighting is used to see how masks stop droplets flying from the mouth when talking, coughing and sneezing: https://thorax.bmj.com/content/75/11/1024

If you will do any type of job containing contact with humans without wearing a mask — i.e. you will deliberately try to kill me first — I will kill you. 

I don't care, if you don't believe in science. If you try to stab me, I will kill you, even if you don't believe in the studies telling that stabbing usually kills people.