I believe that history in general is a very manipulative science. Depending on who is in power, so is the view of history. You and I know this very well.

A vivid example of this can be the Holodomor. This is a huge tragedy. There are many documents in which it is said that the Holodomor was created deliberately with the aim of exterminating the unruly Ukrainian people. All these documents are available in museums and archives. But this does not prevent the culprit from assuring the whole world that it was a famine caused by natural factors.

This event happened only 100 years ago. Therefore, I agree with you, no one knows what happened 27,000 years ago. Maybe the Stone Age petroglyphs were created by children playing, but in fact civilization was more advanced then than we think? Who knows?