“The history of anthropology is soaked with the prejudices of the investigators. “
1. No archeologist in the world owns a sail boat. If any of them did they would have figured out that sailors sail, sometimes just for the fun of it.
2. All Archeologists are of the opinion that all non modern civilizations were peaceful. Au Contraire....most civilizations made war on each other.
Same meme held for decades for the Maya. Peace loving worshippers of nature.
Then the linguists deciphered their inscriptions and discovered they were as warlike as any people in history.
Public torture was more or less the national sport. Human sacrifice was common. Etc.
Same for the Anasazi of the American SW, even claiming the cliff dwellings are't defensive in purpose. Then somebody discovered absolute proof of Anasazi cannibalism. Human DNA in a fossilized human turd.