Traces of Neandertals DNA is what distinguish white Europeans from other human species. Interesting, that Jews don't have that traces, and Arabs too who are accounted as white race today. Even in Indians that traces are rare thing, mostly occuring only in higher castes.

Same thing could be with Denisovians, but for Asian race, but it is not studied properly yet.

So, the theory that Neandertals/Denisovians was kind of degraded Cromagnons looks stretched.

More look like agressive Cromagnons who found to come from Africa and whose direct descendants are Negroes, genocided most of other more peaceful human species like Neandrthals and Denisovians, however their ancestry survived in form of Europeans and Asians, who appear to be more advanced humans than those who are pure Cromagnons descendants.

There is still open question about origins of Semites (Jews/Arabs) who have Cromagnon ancestry, but nor Neandertal, nor Denisovian. May be their ancestor is not found yet, but they could have something that made them different from Negroes.

If you are white and have eyes set deeper than eyebrows, with high probability you have traces of Neandertal ancestry, that makes you different from bulged-eyes Jews, Asians or Negroes f.e.

Whatever theory of humans creation/evolution you stick to, there is at least 3 types of human species in humanity ancestry that eventually developed into races we know. And looks like modern narrative of mixing races is a final battle of Cromagnons to dissolve Neanderthals/Denisovian ancestry to complete elimination. Since TPTB want this badly, I suppose that there is something very valuable we have from our Neanderthals ancestors and therefore they are definitely not some kind of degraded or underdeveloped humans as TPTB want us to think.