"And if possible a coconut Nintendo system"

In Greg Bear's Eon, after the nuclear war, selfishness is seen as a crime of stupidity : people hoarding resources are shunned and don't fare as well as those who co-operate. I always liked this interpretation better than the "it's every man for himself !" popular trope, fun though it can be, and in fact there's good evidence that this is generally what happens after a disaster. Here's some more.

These days, ‘Ata is considered uninhabitable. But “by the time we arrived,” Captain Warner wrote in his memoirs, “the boys had set up a small commune with food garden, hollowed-out tree trunks to store rainwater, a gymnasium with curious weights, a badminton court, chicken pens and a permanent fire, all from handiwork, an old knife blade and much determination.” While the boys in Lord of the Flies come to blows over the fire, those in this real-life version tended their flame so it never went out, for more than a year. 

The kids agreed to work in teams of two, drawing up a strict roster for garden, kitchen and guard duty. Sometimes they quarrelled, but whenever that happened they solved it by imposing a time-out. Their days began and ended with song and prayer. Kolo fashioned a makeshift guitar from a piece of driftwood, half a coconut shell and six steel wires salvaged from their wrecked boat – an instrument Peter has kept all these years – and played it to help lift their spirits. 

Worst of all, Stephen slipped one day, fell off a cliff and broke his leg. The other boys picked their way down after him and then helped him back up to the top. They set his leg using sticks and leaves. “Don’t worry,” Sione joked. “We’ll do your work, while you lie there like King Taufa‘ahau Tupou himself!”... They were finally rescued on Sunday 11 September 1966. The local physician later expressed astonishment at their muscled physiques and Stephen’s perfectly healed leg.

See, in the endless crank-a-handle terrible Netflix dystopian sci-fi shows, people have no basic emotional control. The slightest provocation escalates until people start punching each other or someone gets murdered or the planet explodes. Nobody ever says sorry and nobody ever forgives anyone. Presumably, it's easier to write viewer-grabbing shows by means of hugely dislikeable teenage idiots than it is to write a plot that's actually of any interest. Or maybe, more generously, all these shows are intended as instruction manuals as to how not to behave in a disaster...

Real people, on the other hand, don't fly off the handle because of What Their Sharon Said About Our Jason, and they forgive each other all the time. That's part of human nature just as much as selfishness and stupidity. That a group of children should know not to behave like complete morons strongly suggests that morons are something you have to nurture. You have to work quite hard to get a complete jerk.

And you do get jerks, unfortunately. See Netflix's Fyre documentary for a case where a minor disaster led to rich overprivileged unskilled idiots behaving exactly as you'd expect. Or a bunch of wars and other disasters caused solely by human failings. So culture must play some role. Therefore I propose an experiment, involving random samples of children from different countries of similar age distributions and requiring a whole bunch of unpopulated islands... I can't imagine why I wouldn't get funding for this.

The real Lord of the Flies: what happened when six boys were shipwrecked for 15 months

For centuries western culture has been permeated by the idea that humans are selfish creatures. That cynical image of humanity has been proclaimed in films and novels, history books and scientific research. But in the last 20 years, something extraordinary has happened. Scientists from all over the world have switched to a more hopeful view of mankind.