This [answer] (https://www.reddit.com/r/AskHistorians/comments/9gosa2/my_father_said_that_after_the_nuclear_bombings_of/e66tp5q/) by /u/restricteddata goes into the apparent lack of looting and opportunistic crimes post-nuclear bombing in Hiroshima. It should be noted that many Japanese cities had already been bombed (though not to the same extent causality-wise) yet the Japanese government was still able to maintain law and order over the general populace, so anarchy should not have been expected by such a late point in the war.