Large groups of people are so embarrassingly bad at predicting the future that I'm always impressed when they get it right; but trying to do so often has a lot of positive side effects. Being ready to secede is a stupid one, but as a metaphor for "something goes wrong and we can't rely on people 1,000km away to provide for us" it would lead to some excellent planning.
Modern society is extremely efficient, extremely cheap and profoundly untested. We've had commercial electricity for 15 decades, the internet for 3 decades and quality GPS for 2. These are not long times on the scale that a country's logistics channels operate at; because things so central to how we work need to be ready for 1 in 100 and 1 in 200 year style events. Excessive caution may not actually be excessive.