Answer:
There are some people with breathing problems that will effect them if they don't wear a mask or if they do mainly because corona can cause lung issues. If these people are at more harm if they catch corona so they shouldn't even be outside for there safety. Don't be so quick to judge either if someone's not wearing a mask a number are legitimately not able to wear masks so please don’t vilify individuals or don’t make the assumption they are simply stubborn. There will be people with medical, behavioral, psychological reasons certainly don’t make an assumption that they should be the subject of your ire.
Hope this helps!! Please let me know if this is wrong!! :D