Screaming Penguin - Source Does Matter

A kind of strange article at NYT:

Acts of personal vengeance reflect a biologically rooted sense of justice, they say, that functions in the brain something like appetite. Alternately voracious and manageable, it can inspire socially beneficial acts of retaliation and punishment as well as damaging ones. The emerging picture helps explain why many people who think they are above taking revenge find themselves doing nasty, despicable things, and how unconscious biases pervert what is at bottom a socially functional instinct.

"The best way to understand revenge is not as some disease or moral failing or crime but as a deeply human and sometimes very functional behavior," said Dr. Michael McCullough, a psychologist at the University of Miami. "Revenge can be a very good deterrent to bad behavior, and bring feelings of completeness and fulfillment."

Retaliatory acts, anthropologists have long argued, help keep people in line where formal laws or enforcement do not exist. Before Clint Eastwood and Arnold Schwarzenegger, there was Alexander Hamilton, whose fatal duel with Aaron Burr was commemorated this month on the banks of the Hudson River. Recent research has shown that stable communities depend on people who have "an intrinsic taste for punishing others who violate a community's norms," said Dr. Joseph Henrich, an anthropologist at Emory University in Atlanta.