I wonder if DH ever studied Roman history?
"Beware the leader who bangs the drums of war in order to whip the citizenry into a patriotic fervor, for patriotism is indeed a double-edged sword. It both emboldens the blood, just as it narrows the mind. And when the drums of war reached a fever pitch and the blood boils with hate and the mind has 'closed', the leader will have no need in seizing the rights of the citizenry. Rather, the citizenry, infused with fear and blinded by patriotism, will offer up all their rights unto the leader and gladly so.
Julius Caesar
Edit;
OK, possibly not Mr Caesar, but whoever wrote it could have had DH in mind.