Understanding the terms of this global conflict is presented as a logical problem understood by the executive branch, but only partially coming to be comprehended by the American public.  The novelty of the antagonist is key to his remarks on the South Lawn.
 
This is a new kind of  -- a new kind of evil.  And we understand.  And the American people are beginning to understand.  (George W. Bush 9-16-01)

A few days later, in contrast, al Qaeda is presented as a familiar enemy in the address before Congress.
 
They are the heirs of all the murderous ideologies of the 20th century.  By sacrificing human life to serve their radical visions -- by abandoning every value except the will to power -- they follow in the path of fascism, and Nazism, and totalitarianism.  And they will follow that path all the way, to where it ends:  in history's unmarked grave of discarded lies. (Geoge W. Bush 9-20-01)

Bin Laden also presents a familiar enemy, but one in which the reference point is World War I rather than World War II.
 
Following World War I, which ended more than 83 years ago, the whole Islamic world fell under the crusader banner - under the British, French, and Italian governments.  They divided the whole world, and Palestine was occupied by the British.  (Osama Bin Laden 11-03-01)