Romans, huh? Many of them were slaves, they believed they could learn the future by looking at the patterns of birds in flight, a Roman's bloodline was very important to the Roman's importance. You can take "behaviorally identical" too far, ideas got better over time, people in the past had bad ideas.
Still sounds a lot like humans today. Many are still slaves, many believe they can learn the future by reading cards with funny pictures on them, for some bloodline is very important, as is race.
I don't think we are meaningfully different at all. The same types and groups of people and social structures all still exist today. I suppose the big difference is those of us who are well adjusted know that racism is not good, and tarot cards are meaningless woo woo. But there were also such skeptics back then too.
is not too difficult to find "very bad ideas" today, just look around. The point is about knowledge and culture, not individuals
If that's sarcastic, good one :)
If genuine, I'm puzzled. In the current world we have a tremendous amount of people who hold various superstitious beliefs as well as spend tremendous amount of time on their genealogy. And nepotism never went away. I agree those are "bad ideas", but don't see how they differentiate us from people 5k years ago?