Little looting? The various theories in common discussion do not take into account that to be arrested in Japan means a better than 95% chance of being found guilty, and punishments often require long periods of imprisonment. After release from jail, there is little chance of rebuilding your previous lifestyle. It almost always leads to severe degradation in one's prospects in society.
A lot of the theories talked about here in the US are relative to our culture, not Japan's. What do you think the looting situation would be like here if there was a high probability of being caught, arrested, convicted, severely punished, and then financially ruined? In Japan, there is also the likelihood of being financially ruined before going to trial. Arrested people tend to spend a great deal of money to avoid the consequences of being found guilty, so they effectively go broke before a trial occurs.