I would think cost/benefit is the way to go. We would never institute DUI checks every two blocks on a semi permanent basis even though it would certainly save some lives. If there was a rampant epidemic of drunk driving we probably would.
So if there were bars in surrounding areas that were notorious for drunk drivers, it would be reasonable to set up DUI checkpoints to keep them from driving on your neighborhood's streets?
Avoiding venues where thousands of people will be together where there are reasonable alternatives or avoiding substantial crowds in areas where there are particular vulnerabilities such as long-term care settings seems like a reasonable precaution at this point.
An infected person is indoors with no masks or social distancing with 100 other people, let's say in a shul, and let's assume 50% were previously infected and their immunity has not run out yet. If even 10 people catch it from that person, and they go out into the community, what are the chances it can be stopped before it gets to your threshold of acceptable cases and you're no longer ahead of the game?
I realize this is subjective and that others may have a different subjective opinion of what is reasonable at this point.
Absolutely. I'm just trying to figure out how you plan on staying ahead of the game. This thing moves pretty fast.