Cultural upbringing shapes human nature far more than biology does.

Evidence

Dissimilar socialization practices produced markedly different characteristics in different Native American peoples. The Apache and Comanche peoples raised their children to be valiant warriors (Goodwin, 1942; Linton, 1945), whereas the Hopi and the Zuni, who embraced peaceful lifestyles, reared children with gentle dispositions (Goldfrank, 1945). — Albert Bandura, Moral Disengagement, 173

Categorization

• XREF: Connects to the classic Mead-Freeman Samoa debate and to the same nationalism-versus-culture argument Bandura makes about national identity elsewhere. — connects to: Culture has redirected human genetic evolution since Homo erectus, not only recently. — Joseph Henrich, The Secret of Our Success: How Culture…, 1051; Cultural evolution has been the central driver of human genetic evolution for eons. — Joseph Henrich, The Secret of Our Success: How Culture…, 1015; Individual-focused holistic education hides culture’s shaping role — Rebecca A. Martusewicz, Jeff Edmundson, and John Lupinacci, EcoJustice Education: Toward Diverse,…, 254 (+6 more)
• SEED: An essay could compare the Hopi-Zuni peaceful childrearing with the Swiss and Swedish national transformations as three independent proofs that societies can be deliberately redesigned toward peace.