I have to rhetorically ask why, if close contact is the primary cause of transmission, are the airports, trains, busses, and interstate highways still open?
I haven't been to an airport since March 16, but every day many thousands of people fly. Each state maintains at least one airport, a sometimes congested public place, where people from all over the country and world disembark from a sealed cramped fuselage, without having quarantined.
I realize the question is loaded.
But it feels a little like Prohibition, except that the bars are allowed to stock booze, but, if you crossed a state border, you can press your face to the glass but not go in.
Common sense would treat mass transit the same, actually more restrictive, as bars and restaurants. But sometimes it seems like common sense got up and left the room.
As someone who went to CO to ski the week before and during Christmas - ^this 100x. You can judge my choice anyway you want. Skiing (and frankly the whole week) never felt unsafe at the Evil Empire - but this part of the trip really shook my confidence in the ability to go again this year. And this is coming from someone who has 2 million miles on AA, traveled every week prior to mid-March 2020, has a few perks left ie. big seats, and had not been to the airport in 9 months. Shocking actually, talk about a super spreader event. Whatever the airlines tell you, "caveat emptor" - and the random "outrage" videos of people getting kicked off of flights for non-mask wearing - I can tell you in my limited sample size of 2 flights + 2 airport visits - 30 percent of the people either don't know that a mask covers your nose or are eating/drinking 100% of the time, so they "get out" of wearing one.
Wear a mask. Don't gather indoors in large numbers. Maintain a reasonable distance from people you don't live with.
That's a pretty good start, and it's just not that hard.
Unfortunately, those unwilling to take even the most basic steps are legion.
^QFT.