Quote from Ricter:
Turns out there is looting in Japan. We don't know how much, yet. Probably their media is not keen to advertise it. There is some opinion that in addition to Japanese "politeness", they also have a lot of police and, interestingly, the Japanese mafia, around to maintain order.
But the very best yet not perfect explanation for theft in general, across cultures, is relative deprivation. And stratification creates that feeling. Even other primates in a state of relative sufficiency will raid other groups that have more. Unlike them, the human primate can also symbolically rationalize the behavior.
Generally speaking...
Japan, homogeneous and relatively unstratified = not a lot of looting.
Chile, homogeneous and quite stratified = a lot of looting.