Common sense:
Very high odds of catching the virus from someone infected in your house then shopping in a grocery store. If a household has no one infected and no one goes shopping, the odds are very low.
If someone goes shopping then the odds of a household getting infected goes up. The odds are even higher if that person who goes shopping does not take steps for protection (mask and wash hands).
Why Masks Are Essentially Useless
Scott McKay at American Spectator explains why the mask is essentially useless: "....The mask is not an adequate defense against the COVID-19 virus, gang...."
"....The virus checks in at somewhere between 0.06 and 0.14 microns, meaning it’s too small for any commercially available mask to effectively filter it out. The pores on an N95 mask, which are the best masks you’re reasonably going to find, and the vast, vast majority of you are not going to have N95 masks but rather cloth masks, which perform far less well, are 0.3 microns....”
Washing your hand thoroughly is the best defense. I live and work on a farm so I am used to washing my hands when I come into the house after working outside.
And don't touch your eyes, nose or mouth, which is where the virus finds entry into the body.
But I haven't worn a mask since this whole thing started. Like the man says, they're useless. They only make the people who wear them "feel" good about themselves.
Which is the first clue you should have that these politicians and their "medical experts" don't have a clue about what they are saying when they make masks mandatory.
In the county where I live, the country commissioners make these determinations. Currently they make it a requirement that everybody who goes into a business establishment has to wear a mask....out of an abundance of caution. These are lay people deciding these things that affect our lives and economy. And yet they don't know that what they are requiring is useless.