> As far as I know, countries that were shattered in World War 2, like Japan and Germany, are less violent on average Mainland Japan did not see any ground fig

> As far as I know, countries that were shattered in World War 2, like Japan and Germany, are less violent on average Mainland Japan did not see any ground fighting, only firebombing and the two atomic bombs. Therefore, one would not expect the locals to have been exposed to the results of infantry firing thousands and thousands of bullets.