Thirteen years after the attack on Pearl Harbor it was December 1954. The risk of an attack by assets of Germany or Japan in December 1954 could reasonably be called low.
We are thirteen years past the attacks on the United States that occurred on September 11th, 2001. Would anyone be surprised if the United States was attacked again today? Tomorrow?
George Bush's biggest mistake was not going to Congress on September 12, 2001 and asking for a declaration of war.