Just because half the human race is infuriated, and the other half feeling now justified in enslaving or worse the first half, does not make the research mistaken, wrong, or unfortunate. If I wanted to exterminate a few billion people, or all of them, I would not even think to look for an excuse or a reason - what might such be, after all? Policy (speaking as one who has been there) has nothing at all to do with facts. It has to do with advantage, in terms of mostly relative values, then coalition maintenance, then vested interests be they material or immaterial.
Facts come along when ordinary people discover that none of the policies work, unless they are bent to accommodate the facts.
There are lots of 500-year or longer historical trends - not enough for genetics but nearly enough for cultural stuff - that show that diverse populations that SURVIVE as diverse populations have to develop ways and means of turning same to advantage, which usually improves economic prospects as well. There APPEAR to be some differences in the means and medians for various characteristics, linked to gender or maybe predominant continent of origin. Perhaps this sort of diversity too is helpful.
Then there is the billiard ball theory, that everybody had to start somewhere, and kept going until the water got too darn deep. That would be to places like the Atlantic, Pacific, and Indian Ocean coasts of the big Europe-Africa-Asia-Australia landmass, which might of course also be benefiting from (a) ocean harbors and (b) rivers draining hinterlands. Who knows but its fascinating.
DON'T LET THE PC POLICE waste any more of any one's time! Merge them with USA Homeland Security, and then abolish them totally!