Several factors at play:
- people thought COVID19 was not a thing outside of cities so people were more careless in rural areas
- wearing of masks is much less in rural areas than cities
- more local communities in rural areas (religious services for example)
But if you NEED to isolate yourself it's much easier to do it in the countryside than in a city.
In practice there are several flaws in that assumption. The lack of grocery deliveries is one major issue with rural isolation. Keep digging and you find several short vs long term issues. Consider, if you need a car you then need to eventually take it in for repairs etc.
Further, going to work is a larger concern. A higher percentage of people in cities can WFH indefinitely.
Yeah, I worked out the space requirements once, and it's actually feasible to stock a lifetime's worth of Calories in a fairly small apartment.
Some of this is simple variance, but rural areas are surprisingly dangerous over time where cities simply show up sooner.