As I said here

The Primal Brain saw social groups as a means of survival, loved to socialize and be in favor with his community

You are right. The social dynamic of early settlement is very different from socialism as we know it today. It was but my lack of better wording. I would say It was socialism or communism in the most primitive form.

And I agree Individualism is also very good and widely acceptable when the Individual does something innovative and good for the rest of society.
If an individual does something for selfish reasons that affects the rest of the society negatively, I'm sure it would be shunned and judged negatively