Because both of the things are beyond the scope of people to either really effectively to describe or in any way to control.

因为这两个概念都超出了,人类真正能够描绘和控制,的范围。

普林斯顿公开课 - 人性课程节选

I think the answer is that both play a role but some of the effects are due to stereotypes above and beyond in-group favoritism.

我想两者都有,但刻板印象的影响,要高于组内偏爱。

耶鲁公开课 - 心理学导论课程节选