Missouri offers "a great combination of climate and permissive laws," according to a study. Furthermore commended are "zoning regulations, building codes, and even homeschooling" in the Show Me State. The comparatively brief temperate winters (which are up for debate) are also mentioned. The conclusion that Missouri is a fantastic place to live if you want to be self-sufficient is one with which I agree.
An adversary's WMD doesn't always have to be the source of the electrical grid compromise. Modern electronics might likewise be destroyed with little to no notice by a Carrington-level solar flare, similar to the one that devastated the planet in 1859. Essentially, the ability to be self-sufficient makes you safer than most others. This newfound acclaim for Missouri is therefore more relevant than before.
You may or may not know, but one of the most terrifying weapons an opponent may employ against the United States is an electromagnetic pulse weapon, or EMP for short. The entire electrical grid might be destroyed in a matter of months or even years.