@Arjuna,
My father in-laws Canadian regiment was erroneously bombed by American bomers in WWII. Many were killed and injured. The American planes then moved over and wiped out a division of Polish soldiers. My father in-law's Company were fighting the SS when the SS put out white flags. As his Company moved in, the Germans started firing at them and killed some of the men. May father in-laws cousin was in the Battle of Hong Kong with the Royal Rifles of Canada and was tortured and died in a Japanese POW camp.
Should my father in-law hate Americans, Germans and Japanese? He does not. But under what I am reading here he has every right to. He chooses not to. You see, it was only those individuals involved that did these things. Not the American, German or Japanese people. It was the individuals. He does not blame whole nations for a few.
Sure, you can say that was wartime. But, does that matter? A few attacked the WTC in New York City. All Muslims, it seems, now must pay for it.
People quite often think with their emotions instead of with their heads. Humans are, indeed, a funny bunch.