Churchill knew it was a coming and told FDR. They both agreed that the United States needed to enter the war but needed a reason. The Japanese purple Cypher was broken by the code breakers at Bletchly Park so they were reading their mail for months and knew the exact time, date, and location of the attack. FDR and Churchill didn't care about the loss of life that was about to happen. To them is was an acceptable loss.
Churchill knew it was a coming and told FDR. They both agreed that the United States needed to enter the war but needed a reason. The Japanese purple Cypher was broken by the code breakers at Bletchly Park so they were reading their mail for months and knew the exact time, date, and location of the attack. FDR and Churchill didn't care about the loss of life that was about to happen. To them is was an acceptable loss.
That's the way they roll. LBJ said the same thing about the sailors of the U.S.S. Liberty. In rather more foul language.