I'm having a hard time finding a way to explain what I meant when I raised the issue of ethnocentricity. I'll try, though.
In The Way, we were fed the idea that "our" group was somehow better than "their" group. Hey, I mean, they were just empties floating by, right?, while we held all the power of the universe at our fingertips. But, how do you maintain that personal conviction? Simple. You "renew your mind" to the prescribed beliefs and become like-minded with each other. You foster a sense of belonging. Of course, in the process, you sacrifice your own sense of personal identity.