"There are three reasons for hatred: fear, anger, and incomprehension.  Fear involves both a sense of what others might do to you and the past wrongs whether real or imagined that have been done.  Anger is seemingly a more rational reaction to perceptions of injustice and wrongdoing.  Incomprehension is the failure to understand the other, which makes it easy to demonize.  September 11 underscores the need to eradicate that incomprehension."
Shashi Tharoor  Indian novelist