I suspect what Jim is getting at is that anyone that has the resources to own a sailboat, plus a few days of emergency supplies, isn't going to starve in the United States during any reasonable natural disaster.
If you are poor, have no resources or personal transportation, you would fare worse. But they don't own boats, nor can afford to stock mass provisions.
However, I have nothing against a doomsday plan at all. I was a boy scout, be prepared. Fielder's choice.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.