Traffic is a perfect system for understanding immigration. Being a polite driver is not self-interested behavior. One can often go a bit faster by being antisocial. In much of the world, traffic looks like the right. Because most people will not personally sacrifice to maintain a prosocial system. Our traffic systems, our parks and common areas, our jury trials, and much of what is special about western society rests on this type of prosocial altruism (non-kin fairness). When a population falls too low on this attribute, everything decent falls apart.