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.
That's probably the best strategy, but no one wants to admit it. Everyone seems to think that Lord of the Flies depicts human nature, when in reality teen boys on a deserted island are more likely to form a band than kill each other (https://en.wikipedia.org/wiki/Tongan_castaways#Cast_away) and adults are even better behaved.
yeah my folks live on an island off the coast and there are real concerns over things like tsunamis, flooding, or even just strong winds that knock out power for a while.
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"