Sometimes, "They're all the same and are different from us" is pretty much correct: We're told in sociology class that there is tremendous diversity within any minority group, and it is a serious error to believe otherwise. And when you calculate the mean, the average minority is going to turn out to be the same as the average majority individual. In fact, you don't need to collect data and calculate the mean: fervent faith is all that is needed.
Jews are an example of this. There are even well-known expressions like, "Two Jews, three opinions," and, "Jews are just like everyone else, only more so."
Well, it is better to take an empirical approach to the matter, because it turns out that on some questions, Jews aren't that diverse, nor are they like the average.
Here are the results (GSS data):
Percent in favor of abortion for any reason
Extreme liberals 62.0
Percent who agree that a person should get a police permit to own a gun
Extreme liberals 81.2
Percent who agree that the U.S. should take an active part in the world
All Americans 67.2
Percent who really like Israel
All Americans 34.0
Percent who agree that immigrants improve America by bringing new ideas and culture
All Americans 57.0