Because that was, and has been, the default position of the medical scientific community for as long as I've been alive. (actually, even longer)
It's still the position of those more interested in actual medical science & less interested in bureaucratic political careers. The Association of American Physicians and Surgeons (AAPS) would be one of them:
https://aapsonline.org/mask-facts/
Of course, if you have a position that differs from the political elitist class & their mainstream media lackeys, you don't count & no one hears about it.
& that's why Fauci "disappeared" from the radar for 2-3 weeks while he "got his political mind right" & came back touting masks as a miracle.
Which is nothing new.... Anyone that lived through the 80s has seen Fauci do that exact same politically choreographed two-step before... that's old news.
If you understand anything about physics (it's a thing they used to teach in school - ask your grandparents), know the relative sizes & characteristics of the properties involved, & apply some common sense, you know being told you can "stay safe" by placing a cocktail napkin or a piece of your wife's underwear over your pie-hole & schnozz is the equivalent of it being possible to catch a mosquito in a codfish net.
"Oh, but it the '
droplets' that you're catching."
Really?.... "droplet" is a relative term.... got a size range on the ones yer yappin' about? I don't care
WHAT your girlfriend told you.... size matters Sparky.
Hold that piece of old wife-beater t-shirt someone sold your gullible *ss as a "mask" that you're wearin' up to the light.... can you see through it? 'Cause if ya can, & I'm betting you can.... you ain't stoppin' sh*t.
"Droplet", as far as your normal breath goes, can be as small as 0.3 to 8 micro meters. In millimeter terms, there's a couple zeros to the right of the decimal point there. You ain't seein' 8um without a microscope. (in some circles we call that size range an "aerosol"... just so you know)
Think I'm kidding?.... Ever seen anyone that wears glasses breathe on them to clean 'em? Where'd that "fog" come from that suddenly appeared on the lenses? What do you think that was?
The moisture "droplets" in their breath. They just gathered on the glass in a concentration dense enough for you to see 'em.
We exhale "droplets" all the time, only when we talk, cough, sneeze, etc do we apply enough force to dislodge ones large enough to see. The smallest ones come on a routine basis. We are over 60% liquid after all.
Now, is a 0.3um droplet/aerosol particle large enough to contain a virus? Well, I don't know about you, but I tend to think that something we can see with a microscope is large enough to contain something that the most powerful optical microscope on the planet can't. Yes Sunshine, 0.3 micro meters is larger than 5 nano meters. By a factor of about 600. (0.003 vs. 0.000005)
& even if you were lucky enough to catch that "droplet" in your used underwear, it's only going to stay there long enough to be dislodged by your next exhalation blast.
& don't tell me I should feel safe wearing a Kotex over my face for hours on end soaking up all sorts of nasty-*ss crap & saving it for later. What an awesome concept... something didn't quite make it through the 1st time, let's give it multiple repeated attempts at the assault. Exactly what brand of genius thinks
that's a good idea? Someone remind me never to trust my well-being to
THAT guy.
Look, if you wanted to make the case that putting on a
disposable mask only for as long as needed in a higher-risk space & then actually
DISPOSING of that mask immediately upon leaving that space might have a remote chance at tilting some of the odds slightly toward my favor, that might be something I'd have a hard time arguing with. However slight, it might move the needle just a tad. So sure, OK.
But, anything short of that.... you ain't stoppin' jack sh*t.