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Well, Lincoln was not, because he refused to accept the obvious, that the Deep South was dead set on secession.
Nor was McKinley, who was pulled by politics and by an intransigent Spanish government into war over Cuba.
Neither was Woodrow Wilson, until the Germans let loose their submarines after Wilson's diplomatic "surge" failed.
Nor was Harry Truman, whose secretary of state made the mistake of declaring Korea to be of no concern to the US.
Nor was John Kennedy when he gave the greenlight to the CIA operation that ended in the Bay of Pigs, nor arguably, was he prepared in October, 1962 for the atomic war that almost happened.
Nor was George Bush, because like the Clinton administration, he failed to take Al Qaeda seriously despite everything that had happened since 1993. You seem to have forgotten the incident in China in May,2001 especially since half the Pentagon was focused on Chin's military buildup, with the Middle East getting short shrift there.
Speaking of delusions, how many terror incidents will it take the likes you to admit that
we are fighting a war with Muslim fanatics whose vision of he future looks a lot like the 7th Century?