It is not contradicting, Like you yourself said, people being cooperative is not in itself enough for traffic to be not chaotic. You still need well architected

It is not contradicting, Like you yourself said, people being cooperative is not in itself enough for traffic to be not chaotic. You still need well architected rules and enforcement. It is also a function of desperation. If there's enough resources for everyone, it's easier to be nice. When there isn't enough for everyone, or when people feel that there isn't enough, things start to go south pretty quickly.