I don't think it is easy for us today to understand how slow information was to travel during the time of the war nor is it easy for us to understand how incomprehensible it would be to accept reports about a single bomb creating as much destruction as was reported at the time.
While the slow reaction of Japan might be incomprehensible if the same events happened today I think it is dangerously misleading to apply todays standards regarding communication loops and the destructive force of atom bombs to the events of the late 1940s.