Ну и в отношении MAOA вы также не правы. 1) Этот вариант гена работает иначе - http://www.pnas.org/content/106/7/2118.full, а именно изменяя реакцию на провокации. 2) Частота генов в разных популяциях различна:

Three studies over the past five years hint that the especially dangerous 2-repeat allele might be more common among African Americans.In one study, 6% of nonwhite subjects had this allele.² In another, five of 37 (14%) African-American men possessed these rare MAOA alleles. Those percentages are remarkable given that in both studies, fewer than one percent of white men had this gene. A third study determined that 0.5% of white MAOA genes and 4.7% of African-American MAOA genes feature this 2-repeat allele—almost a tenfold difference.

Such a link has been asserted by a research team led by Michael Vaughn of Saint Louis University. He and his colleagues looked at the MAO-A promoters in African Americans. The subjects were the same 2,524 American youths in the study by Shih mentioned above. Of the African American men in the sample, 5% carried two MAO-A promoters, the condition that Shih had found to be associated with higher levels of delinquency. Members of the two-promoter group were significantly more likely to have been arrested and imprisoned than African Americans who carried three or four promoters.

http://theunsilencedscience.blogspot.de/2012/12/sc...

Ученые подчеркивают, что "плохие" варианты генов MAOA и CDH13 проявляют себя, если ребенок растет в неблагополучной семье, если его воспитанием не занимаются или если у него слишком авторитарные родители

А патриархальные общества арабского мира широко известны своими достижениями в области воспитания детей и антиавторитаризмом среди родителей