Whole nations can transform from warlike to pacific within the same gene pool

Evidence

Intracultural diversity also calls into question the view of aggression as innate in human nature. Although the United States has its share of violence, the Quakers, who are fully immersed in the mainstream culture, embrace nonviolence as a way of life. The strongest evidence against an innate trait of aggression is the transformation of entire nations from warring societies to pacific ones. The Swiss once were the main suppliers of mercenary fighters in Europe. After they transformed into a pacific society, they still maintain a standing army but deploy it for peacekeeping and lifesaving missions (Swiss Armed Forces, n.d.). Perhaps the most familiar aspect of their more militant past is the colorful uniforms of the Swiss-born Vatican guards. — Albert Bandura, Moral Disengagement, 176

Categorization

• CANDY: The Vatican guards’ colorful uniforms being a remnant of Switzerland’s mercenary past is a light, self-contained conversation tidbit.
• corroborated: 2 independent passages support this claim — Albert Bandura, Moral Disengagement: How People Do Harm…, 176