Earlier quoted context omitted.
Just because you provide sources doesn't mean your sources are relevant to your argument or good sources. Go look at his memo. It is paragraph after paragraph with his beliefs on the matter and then a link to some source which you are supposed to check out. He often doesn't bother explaining how those sources are relevant. That's why it is bad. Just because you've got sources doesn't mean you are saying anything usef…
It's not a scientific paper, it was an internal memo shared with a few colleagues. Also that's how evidence works, you make a narrative and support it with references. What else would you do? No society has lasted tens of thousands of years and many were in complete isolation which already says something about how the same roles formed again and again. Also we see the same thing in animals.
You use references in scientific papers; not in everyday conversations. You do it when you want to refer to previous work that your own work is based on, not to win a debate and not to show that there is support for your beliefs.
The fact that Demore's memo was not a scientific paper, but was peppered with references to various scientific works he lacked the training to understand only serves to underline how silly it looked.
>> Also we see the same thing in animals.
We also see cannibalism (including sexual cannibalism), incest, fratricide and all sorts of nasty little things in animals (particularly insects). We see the same things in humans (except maybe for eating your mates after sex).
So, what?