ok 1) Psychologist have concluded in order for humans to get through the day and we have to filter things out and generalize the stimuli we receive, our brain has to quickly lump things/people in a group or category or else we would be overwhelmed and we'd just collapse from over stimuli.
2) your examples seems to only list and point out offenses made by the white americans, you think its only white that make these hateful generalizations? And who and why was there an 9/11 attack? Could it be Muslims who hatefully generalize America as a sinful evil nation?
I think maybe I'm just to turn your assertion around on you, you think its white who perpetrate so much "irrational hate" on others, yet in 2012 it seems like its the average white person who are guilt-ed and bullied and facing more hate than any other group.
PS- And if you think I'm a white KKK member you couldn't be more wrong, I'm not white but I see a lot of my friends who are, are so afraid to make a joke or unintentionally offend others.