Abstract: Why do conflictual interactions in today's Western society systematically resolve to the advantage of those who attack the rules? The Mechanics of Community answers this by formulating the "Theory of the Three Domains." Human action is biologically pre-wired to operate on two natural levels: the Environmental Domain (physical space) and the Social Domain (micro-communities and Roles). In these domains, to guarantee our survival, our DNA uses two formidable cognitive engines in synergy: System 2 (for cold planning) and System 1 (for instinctive action in emergencies), assigning a precise role to every element: "Threat" or "Resource." However, the modern State has forcibly inserted a third, artificial level: the Immanent Domain. This architecture imposes a schizophrenic "Double Role" on social space: it forces the victim to process the aggressor simultaneously as a lethal threat and as an untouchable bearer of sacred rights, turning off System 1 by law. This gigantic short-circuit sends the defender's mind into a tilt, generating a cognitive overload that hands the absolute tactical advantage to the attacker. Keywords: Environmental Domain, Social Domain, Immanent Domain, System 1, System 2, Double Role, Daniel Kahneman, Cognitive Overload.