Its always good to be prepared materially, physically, and psychologically. The best preps are not supplies, but relationships. Social credit matters more, IMHO, than anything else when it comes to long emergencies.
they live in a cul du sac and there are a bunch of community watch meetings where the folks get together and basically said "if shit goes down we need to be able to live together, so that means we need to 1) have trust, and 2) have the gear"
Of particular note are the few people with big trucks and boats, and the general gist of the planning was "live long enough on the island to be stable, and then use those boats to get off"