Historically, do you doubt that this is true? Certainly it isn't in modern times, but when we were shaped as a species? The people who worried about having enough food, a strong enough shelter, sharp enough weapons, loyal enough friends and allies-- seems like that worry would be a survival trait.

> Certainly it isn't in modern times, but when we were shaped as a species?

When discussing evolution and species, it's best to avoid the past tense. Evolution never ends, and nature is shaping us as we speak. 200,000 years ago, we wouldn't have recognized our forebears, and 200,000 years from now, we won't recognize our descendants.

Basically yes. It is a giant assumption with no actual science backing it up. Maybe there is some science that I am not aware of. So many evolutionary statements get a free pass in this regard. Someone says it, and now it is so. Where is the skepticism?

I think he's saying that content people lie around sunning themselves and get eaten by lions, or fail to store food for the winter, or whatever.