Why do so many people on Yahoo Answer make an assumption of a group of people based on their ethnicity,religion,and nationality?

And horoscope and sexual orientation.
Why do black men want to have children with white women?
Why do Mexicans hate black people?
Why do Pisces fall in love with Aries?
Why do gay people discriminate non-gays?
Why do Christians insult Judaism?

It all falls down to the individual personality.
Update: And politics.
Why are liberals always doing this...?
Update 2: Even gender.
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