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Do we harm others even if we don't need to?

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Summary

Human societies exhibit both cooperation and warfare, explained by parochial altruism. Experiments reveal strong aggression, a welfare-reducing behavior, paradoxically stabilizes in-group cooperation.

Keywords:
experimental testsin-group favoritismout-group aggressionparochial altruismpublic-goodstrong aggression

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Area of Science:

  • Evolutionary psychology
  • Behavioral economics
  • Social dynamics

Background:

  • Human societies display large-scale cooperation alongside frequent warfare.
  • The "parochial altruism" hypothesis suggests in-group pro-sociality and out-group anti-sociality co-evolved.
  • Understanding this duality is key to explaining human social structures.

Purpose of the Study:

  • To investigate the evolutionary underpinnings of cooperation and warfare.
  • To test the role of "strong aggression" in maintaining social cohesion.
  • To examine the interplay between pro-social and anti-social behaviors.

Main Methods:

  • An experiment was designed allowing participants to choose between pro-social, anti-social, or combined actions.
  • Behavioral data was collected to analyze decision-making patterns.
  • The study focused on non-strategic "strong aggression" and its consequences.

Main Results:

  • Behavioral evidence confirmed the existence of "strong aggression," characterized by welfare-reducing actions for all involved.
  • This "strong aggression" was observed to be non-strategic.
  • The study demonstrated that strong aggression dynamically stabilizes in-group pro-sociality.

Conclusions:

  • "Strong aggression" is a significant factor in human social dynamics.
  • Despite being detrimental to individual welfare, strong aggression plays a role in maintaining group cohesion.
  • The findings support and extend the "parochial altruism" hypothesis in evolutionary explanations of human behavior.