Yeah of course. Violence, like all traits, is moderately heritable 1. Europeans engaged in a multi century eugenics program after the Christian church took over society 2. They executed 2% of their most violent every generation. This resulted in a severe decline in criminality across the European population group.

1. https://link.springer.com/article/10.1007/s10519-011-9483-0

2. http://journals.sagepub.com/doi/pdf/10.1177/1474704915013001...