“It shouldn’t be a mystery were these people came from - the melting glaciers drowned 10,000,000 square miles of prime coastal and river front as well as vast inland areas. But most mainstream science types do not count this major event because it would rock too many boats and raise too many awkward questions, not to mention the loss of professional reputations.”
I don’t know if it’s so much about career protectionism as it might be about what I think of as “steady state-ism”. It’s a natural proclivity to work with how the world geography is currently and forget about how it was during the event under question.
It tends to show up in such things as discussing migration paths into the “new world”. It is known that the sea levels were considerably lower at the time of the events in question, yet most of the theories and hypothesis are developed exclusively from dry dirt archeology.
Another issue is that what we, the gen pop, get told is filtered through idiot media. A media that we know full well only ever gets something correct on accident.
The whole of what is euphemistically called ‘pre-history’ is in utter turmoil and chaos. We do not even have to go back as far as the Ice Age but merely to 3800 BC and the Old Egyptian Kingdom to find the inconsistencies, the wholly overlooked, the forgeries, the shoddy scholarship, and petty academic fiefdoms.
Working with “how the world geography is currently” is to completely omit, to overlook the entirety of the thesis at hand. World history for mass market propaganda and consumption ... those guys no better they are just not going to spoil their markets with the truth. None of them will mention Gobekli Tepe built in 10,000 BC by master stone masons and then deliberately buried.
Their charade is quickly coming to an abrupt halt.