Weapons are in interesting consideration for early human evolution and how we ended up in the place we are with large brains and strong social groups. Kevin Simler and Robin Hanson address the importance of weapons in their book The Elephant in the Brain. Weapons change the value of physical strength and the nature of conflict on the individual and group levels. They altered the threats and defenses that our early ancestors faced and could mount.
“Weapons are a game changer for two reasons.” write Hanson and Simler, “First, they level the playing field between weak and strong members of a group. … Another way weapons alter the balance of power applies to projectile weapons like stones or spears. Such distance weapons make it much easier for a coalition to gang up on a single individual.”
Physical force has been a dominating aspect of human relationships (and probably early proto-human ancestors’ relationships), but we don’t live in societies where just the most physically dominant individuals rule. Weapons are a big part of why this is the case. Once we could hurl projectiles, even just heavy or sharp rocks, at opponents, our social grouping had to change. Coalitions could push back against a dominant individual who did not care about the well being of the group or of others. The role of politics and cooperation could naturally be expected to rise in a system where physical dominance was not the sole determinant of leadership and power.
What weapons did, Hanson and Simler argue and I will discuss more tomorrow, is create a system that favored brain development. Social intelligence and intellectual capacity became more valuable when coalitions could rule with weapons, and that created a space where the brain could evolve to become larger and more complex. If pure physical dominance was the best predictor of power and of passing along our genes, then we would not have expected our early ancestors to begin evolving in a way that favored the development of a large and highly energy dependent brain. By bringing physical prowess down a level, weapons it seems, helped further the evolutionary growth of the human brain.