It means we are an immigrant nation, Japan is not. Neither is China, nor Korea, nor Vietnam.
While we consider looting as illegal some peoples coming from 3rd world nations to live with us may not see looting as a bad thing. They have not learnt right from wrong.
Non-immigrant nations do not need to spend the time teaching newly arrived basics to immigrants they can actually take that extra time and money to teach their own more advanced lessons such as how important a good education is and getting good grades.
Au contraire, the issue, IMO, is not one of them “not knowing” the difference between right and wrong. Very few of the NO looters, if questioned, would have been surprised to have what they were doing described as wrong.
It’s one of internalizing the importance of doing what you know to be right. To where it’s important enough to do it even when financial and recreational incentives point in the other direction.