

Dolphins and killer whales are capable of all the things you describe. So are all great apes. Chimpanzees are capable of genocide. It’s not even human nature. It’s just nature.
Are you familiar with Dunbar’s number? The problem isn’t how people organize, it’s how many people organize. You get groups too big, the human empathy module short circuits and starts ignoring other humans as such…
You know what other animals can organize in large collaborative groups and not fight each other? Ants, bees and mole rats. Eusocial animals.
The problem with eusocial animals is they divide into genetically determined castes… So nature has shown us it’s either small packs or become a drone for the hive, and the problem with small pack is that larger packs destroy them.
I’m not sure if this is what you’re asking but I met a Chinese tourist about 20 years ago. He was also traveling on his own. He seemed like a relatively nice guy, even when drunk. Not like “wow this guy is such a nice person” bu you know. Someone you could grab a beer with. His table manners were umm… different, but I attribute that to cultural differences. Oh and he liked smashing his fist on the table for emphasis and dramatic effect when talking about something that was important to him. He was obsessed with respect. Who respected him, who didn’t respect him, etc. He also had a deep and great love for his country, something he seemed to derive meaning and sense of purpose from.