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I haven't seen any evidence at all that Neanderthal genes were mostly harmful and had to be "purged". For +50,000 years everyone in Europe and Asia was a Neanderthal hybrid with 10-75% Neanderthal DNA. By 45,000 YBP we have mostly modern-looking remains that are still autosomally 10% Neanderthal. Neanderthal ancestry in middle Siberia has decreased by perhaps half a percentage point since 18,000 YBP, if the remains in Afontova Gora are anything to go by. That could be due to European admixture. Neanderthal ancestry pretty much hasn't decreased in Asia in any significant way that indicates natural selection against Neanderthal alleles.
This is quite remarkable given that Neanderthals never made up more than 4% of Earth's population at any given time. According to John Hawks the entire world's population of Neanderthals at any given time could have been seated comfortably at at an NFL superbowl stadium. The amount of Neanderthal ancestry in modern humans is actually higher than what one would expect; given the very shallow populatuon size of Neanderthals as compared with modern humans.
Unadmixed modern humans (west-central Africans and western Negritos) have lagged behind immensely and suffered a kind of "purge" of their own, if you will, throughout recorded history. One wonders if you were given a choice to be born black at any given time in history, vs being born white or Asian with some Neanderthal ancestry, which would you choose? Clearly, Neanderthal ancestry was critical to the current standard of living and status that you enjoy.
Then you clearly haven't read any of the numerous scientific papers of the last years. Just as one example, nature purged huge portions of our X chromosome of their dna.
Even of the dna that's left, not much of it is beneficial. You think it's just great that they left us a legacy of increased propensity to depression, addiction to tobacco, auto-immune disorders, to just mention a few? Please.
I would provide a list of the papers, but clearly you want to persist in your ignorance, for whatever reason, so why bother.
To all reading this thread: Ignore this poster. He is only interested in posting misleading information.