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By "virtue" of breeding like rabbits and spreading a whole array of diseases, including the first incidence of bubonic plague.
You are not in position to correct anything, as you very well know the fallacy of your claims, yet still go on and spread them.
The phenomenon of blondism in the East is nothing new - it has been found as early as in Upper Palaeolithic Siberia (Afontova Gora 3), as well as in their descendants which crossed Urals towards Mesolithic ("EHG", such as Samara (R1b)), and finally in well-developed IE cultures (like Andronovo). Yamnayans were massive outliers in that regard, and no, not all "steppe cultures" hail from them, it is a decades-old misconception that has been proven wrong again and again, in many fields, genetics in particular. A good debunking of it:
https://indo-european.eu/2018/01/the...f-steppe-folk/
Neither were they as a whole of "dark pigmentation", nor did they have anything to do with Native Europeans (somewhat broader face does not equal genetic proximity). They had forwardly-projected zygomata and lateral orbital rims, frequent lack of nasion depression and nasal bridge weakly projected, with the aperture itself being broad and rounded, they had lack of lambdoidal flattening, their orbits were shallow and circular, their maxillae were broad in relation to zygomata, their mandibulae frequently had disproportionatelly small gnathion-gonion distances for their bigonal breadth, etc.
All those traits are in direct opposition to those of UP Europeans. Somewhat broad face does not make you one - a complex array of morphological traits does. Also, those broader steppe types were not the sole IE type - Nordic was well-developed among them even in Mesolithic (in case you wanted to pull the old "it's farmer-inspired" lie), even with a fully developed Corded Nordic from those times being found.
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