@Gargamel,
His "great pains" didn't pay off, IMO. The piece-meal cannibalism, for example, doesn't ring true. We don't cut off cows' legs one at a time, right? Never did, even when people slaughtered animals on family farms. Bandits don't randomly walk down roads, they set up ambushes.
IMO, it's a poor entre into the disaster novel genre. It was done better in
Earth Abides, with many of the same themes. Niven and Pournelle did it better in
Lucifer's Hammer, with many of the same themes, including cannibalism.
Gargamel wrote:plots are a construct of fiction
And this is fiction. A plot provides the framework upon which you hang your philosophy. He could have written an essay, and done a better job of getting his meaning across.