You can say that, but fear being the driving emotion, is still an emotion. And one cannot deny there was a sense of vendictive thirst for blood in the americans in deciding to strike the japanese, in a manner that, in their eyes, was similar to pearl harbor. As well as to make the japanese pay for the lives lost in marching against them in war.

Additionally, one also has to consider the amount of warcrimes. Many aren't justifyable by logic, but by emotion. Even the decisions of disgarding an enemy as less then human is driven through a mix of disgust and pride, two emotions.

Logic: "I shouldn't punch that guy in the face just because he a jerk."

Emotion: "Yeah, I got this."