Genes are of course very important, it's just that I don't think there's a lot of genetic basis for big differences in behaviour across races. Within each big race, there would be a lot of variety in genes affecting behaviour - likely so much that separating genetically caused behaviour from culturally caused behaviour is practically impossible.
I understand you wanna say something like "on average, asians are more genetically disposed to certain kinds of behaviour than black people", but I think that argument is on shaky grounds. It's also hard to test.
