Actually it isn't.
My son and everyone at his job had to wear masks...one person came in only a little sick but was wearing her mask...she got sent home and her symptoms got worse. She later tested positive.
My son hasn't caught the virus because he and everyone (especially the sick girl) was wearing a mask. It's more about protecting everyone else than you. But it helps you too.
You know before this 'thing' arrived this year, people were not wearing any mask from anything beside industrial works for obvious reasons. Never for a fever, cold, virus or whatever or how ever one felt. If it was prudent and the right thing to do one would go home, or as you said in this instance, she was sent home.
Here's the other thing. When a person went home due to illness, you did not go to a doctor if it was not necessary. And if it was, you did not get a DNA/virus detection test done. One never existed and there's none available today that truly can isolate only a unique virus or germ... This testing and testing '+' is done on a machine that is designed for experiential use only and never for any diagnosis according to its inventor and Nobel prize winner. Of course the doctor might not even had this test machine available and still called this person '+' based on a quick physical observation, which is ridiculous and criminal in its self. And they do this today a lot, especially if $$ is to be gained. The climate we are in today is a type of a chaotic war and truth is the first thing to get thrown out.
If she got a PCR machine test done then this machine is very sensitive to detect many virus' or germs in the body that may have existed a day a go, or even 5 years ago, even in very minute quantities. It calls all of it '+'....the doctor cannot say it is for sure COVID-19...a shame what is happening...and the unnecessary fear and pain it has caused...
So you still think that wearing masks makes you not test '+' and then you don't have any type of bug? ..IMO I doubt it very much with great confidence....in fact wearing one on a person that even has the common flu is not helping anyone else around them....the virus gets out very easily through and around the mask...that's the reason why we never did and never should wear one....
There is true science to show that wearing a mask increased the PH level in the blood with the induction of back blown CO2. And the amount of O2 available for breathing is lessened significantly, by up to 20 percent...very detrimental to folks with underling respiratory conditions such as COPD etc.
Then there's the fact that this material catches germs and redistributes them to others not wearing masks....go figure right ...they can harm folks not wearing them..
Personally, I have been around (within inches for at least 10 minute intervals) folks wearing masks that some say were tested '+', many a time and in enclosed quarters, like in a car, and I do not wear a mask..no sniffles, coughing etc..I have not had a common flu since I was in my 20s decades ago..I must be naturally immune I guess to whatever they THINK they have or were especially TOLD to THINK, right.
Bless you,
APAK