>>724139108
Because we have no fucking clue what their culture was about and what God they worshiped.
We know nothing, literally nothing, except what we can extrapolate. The chain of oral history was broken, there is no tether from them to us.

Even bone in the nose Africans have an oral history we can ask them about.
We can read Sumerian texts.
We can read Olmec records.

We have no fucking clue who the Mungo Man was, what his people worshiped, how they lived, how they thought. We have a corpse, and some fragments of tools, and our musings.
THAT is why it is pre-history you fucking idiot.
The chain of knowledge between them and us has well and truly snapped.