Not this again. This is an old missionaries tale. There are descriptions of large cities and palaces in Mahabharata (of which Gita is part). Nomads don't construct palaces and large cities. Also, the Gita is about duty to preserve good not killing. (A few months ago I debunked a similar comment on this site lol)
A somewhat similar process likely happened in the settling of Europe the Yamnaya culture passed through, integrated with, displaced, or dominated the Cucuteni–Trypillia culture and other settled agriculture societies in the Danube & Balkans regions.
> Bhagavad Gita is a short read, you can read and find there are no mentions of nomadic lifestyles in that.
Which was written between 5th century BCE to the 2nd century BCE? So at least 1000 years Indo-European migrations. How is that relevant?
The Bhagavad Gita is quite clear about the cultures of the old Aryan peoples. They were nomadic, cowherding peoples, who were highly patriarchal, that valued prowess in battle and the ability to kill your enemies ruthlessly, even if they were members of your own family. They were probably white because Tocharian speakers in western China are depicted in cave painting as having blond hair and blue eyes[0], a group of people who completely split off the rest of the Indo-European tribal peoples well before they entered the subcontinent.
Is Nazi race science as a justification for brutal genocide and the destruction of labor organizing something I agree with? No, but the Nazis understood that anyone can spin a story to justify any political regime, and that whoever is in power is constantly inventing their own histories to justify their power. None of these things are very meaningful, in the end. Language, culture, and history is far more diverse than the question of Yamnaya genetics.
[0]https://en.wikipedia.org/wiki/Tocharian_languages#/media/Fil...