In addition to my article there are several other articles and many archived reports about this. The science is sound but mass media likes to portray only the dark side of it, Gene's do NOT cause aggressive behavior, but they help set the altitude and may lead to an exaggerated response to stress - when other factors are introduced (nurture vs nature, culture, accomplishments in life etc).
http://area1255.blog...ntricacies.html
http://www.scienceda...90121093343.htm
http://www.psycholog...villain-or-hero
http://topdocumentar...e-warrior-gene/