What's the most unacceptable human behavior?

January 1, 2010 10:06pm CST
We often read and heard on newspaper, internet and television news about ruthless,cruelty and brutality act of human behavior. Those are murders, massacre, rape, abortion, incest so many other hideous human deeds. For you, what's the most unacceptable human behavior that you can't seem to forgive?
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