You don't have to read fiction to make a point. There's evidence all around us. One of the best ways to illustrate tribalism is WWII. I mean, the Japanese and German rulers literally want to go and destroy and enslave as many of their neighbours that don't speak their language as possible because they think they are the better people and more deserving. And the main drive for them is human pettiness and hubris, even the Japanese were doing well trading for resources. I would argue those are not really the very best attributes of mankind. In the process, they ended up nearly destroying everything, and their people suffered deeply. Malcom Forbes, who was supposedly worth over 500million when he died, and was an infantryman with a bronze star and purple heart in WWII, said that the character of a man can be judged by how he treats those that can do nothing for him. Still, he wasn't much of a philanthropist himself, which goes to show how much words are worth
But, I digress - all we need to know about the Japanese and German leaders and many of their lieutenants of the time is how they treated their prisoners. And we we were not without sin. We disenfranchised and imprisoned over 120,000 our own citizens as well during WWII with almost no warning, many of which helped interpret Japanese war documents and questioned Japanese prisoners for the US military, and when the black soldiers who fought for their country returned in 1945, they were once again treated almost as though they were not citizens. Which goes to show, even in a land where resources were nearly uncountable, we can still find a way to do wrong to one another.
Which leads me to a nice segue. I was speaking with a friend of mine who is an academic. The topic was human expansion in to the universe. And he covered all the typical points of evolution, resources, survival of the species in the face of catastrophic destruction or the sun eventually dying, and spread of our culture, create a human catharsis, manifest destiny even snuck in there, etc etc. I said, 'What would you think about us as a race if we were having this conversation immediately after WWII?' His response was that it would be understandable why some would not want us to spread to the stars then. I then said - as far as the stars are concerned, it is still immediately after WWII.