They do, just they know social distancing, hand washing, and not going to public condensed places unless needed helps the virus more than masks do. The masks give false sense of security rather than a supplement to social distancing and so forth. People use masks as if they can "fight off" the virus (from a person's point of view rather than what the masks are used for).
Based on my read to date, 6 feet just isn't going to do it.
The primary means of infection is person to person via our aerosolized respiratory droplets. Transmission by inhalation.
The heavier droplets fall to the floor and flat surfaces. But the lighter particulate can remain in the air for hours. There is an Italian study that found SARS-CoV-2 in the particulate matter of a cities air.
Next concern is the viral load. A mask, even an ill fitting one, WILL reduce the amount of virus that can enter your system.
It has been shown that the amount of virus we come into contact with may determine the severity of illness.
We may be able to inhale a small viral load, and not get ill at all.
Any mask is better than nothing.
If I was working on a covid ward, I'd make mine with two layers of non woven polypropylene.
And don't get me started on the fecal matter mode of transmission.
There was an entire apartment floor of people who became infected with sars covid due to the poor venting design of the building's plumbing.
Those people were inside their own apartments, further apart than 6 feet.
Identifying airborne transmission as the dominant route for the spread of COVID-19
We have elucidated the transmission pathways of coronavirus disease 2019 (COVID-19) by analyzing the trend and mitigation measures in the three epicenters. Our results show that the airborne transmission route is highly virulent and dominant for the spread of COVID-19.
The mitigation measures are discernible from the trends of the pandemic. Our analysis reveals that the difference with and without mandated face covering represents the determinant in shaping the trends of the pandemic.
This protective measure significantly reduces the number of infections. Other mitigation measures, such as social distancing implemented in the United States, are insufficient by themselves in protecting the public. Our work also highlights the necessity that sound science is essential in decision-making for the current and future public health pandemics.
Identifying airborne transmission as the dominant route for the spread of COVID-19
I hope this helps.