Black Genetics

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According to a genetic study, blacks have the highest frequency of a gene, the rs53376 G, that promotes among other things greater male same-sex cooperation.

¿How is this possible? Historically, Africa was a very bad place to be born male. Males suffered high mortality rates due to raids, wars, etc. Old and rich men monopolized women, while poor and young men were condemned to a lengthy bachelorhood. Men had to pay a costly bridewealth to the parents of their future bride, and sometimes even this wasn't enough, and they had to live for years in the household of their parents-in-law, working for them in an arrangement called bride-service. First-born sons were often killed in societies with age-systems that forbade marriage and reproduction for males until they were quite old, and in other societies they were killed for superstitious reasons. In some societies, elder sons were often given to relatives to raise in polygynous households, since the age-gap between the youngest wife of the patriarch and that of his elder sons was dangerously close. The DRD2 A1 and the CYP2A6, too genes responsible for social homophily and social heterophily, respectively, are positively and negatively correlated to BMI, and many populations of the African savannas have a slim male phenotype; not surprisingly, the lowest frequency of the DRD2 A1 and highes activity rate of the CYP2A6 has been found among the Ethiopians, who also have the lowest male adult BMI in the world.

So how is it possible that blacks have a high frequency of such gene, if black men are so mean towards each other? There is a large black population in the US (I'm Spanish), ¿could someone living there tell me if there is high amity and harmony between black men? ¿Are relationships between black men in the US very amiable and harmonious?

I didn't know if I had to publish this in /sci or /his, since it is about science, but also about how historical and anthropological differences have influenced genetic evolution.