I know it’s difficult to comprehend the idea of being hard wire genetically to behave in a certain way, but this is not a breaking new.There is a whole field of research in Genetics that studies culture, genetics, and social behaviour. This field of research is about hundred years old 
All what I’m saying is do not dismiss it based on speculation or conclusions out of observation.
Genes are turned on and off, and culture and environment are factors. most genetic studies that deal with biological disorders like cancer, autism, tobacco addiction, etc have proven that. A person could carry the genes that causes cancer, but could never get it.
A study of population behaviour; that is not a clear cut and obvious disorder; is very difficult indeed. It requires huge amount of statistics, data inquisition to be abe to determine that.
I urge you to go to these links below from the human genome project, and read and listen to what scientists are doing.
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[li]DNA & Behaviour (audio file)[/li][li]Genes and Behaviour: A complex relationship (article)[/li][/ul]


