Joseph Campbell's words on in-group out-group

Below is a quote from Joseph Campbell (reportedly from page 112 of the book An Open Life: Joseph Campbell In Conversation With Michael Toms). I shall posting some of my own thoughts about how religion encourages in-group / out-group thinking and the many examples we see of that in our various holy books. For now, here's a few words from one of the wisest men who ever lived:

“And there's going to be [social fragmentation] for a long time. Unfortunately, many of the new mystically motivated movements are reactionary against other peoples. We have this "Power" and that "Power" and the other "Power." These are delaying actions. People are afraid to move into the free fall of a totally new way of looking at others. So the new mythology to come must be a global mythology, and it's got to solve the problem of the in-group by showing that there's no out-group. We're all members of a society of the planet, not of one particular place, and the fact that the three main religions of the Western world-Judaism, Christianity, and Islam-can't live together in Beruit is a refutation of all three in terms of their value for the contemporary world. They're monstrous! We must begin to realize that each is saying in his own language what the other is trying to say in his. There must be brotherhood and cooperation. Because unless that comes, we're going to blow ourselves to smithereens.

Every single one of the old horizon-bound mythologies reserved love for the in-group, and aggression and denigration were reserved for the out-group. Now, something's got to break that. And when we see that picture of our planet taken from the moon, the question arises: What are we going to do with our aggression? How is it going to be absorbed into love and transmuted from gross matter to gold? I think teaching "I-thou" relationships, rather than the "I-it" relationships, which [theologian Martin] Buber spoke about, is the first step. The teaching of humanity rather than the teaching of in-group appreciations is what's important.”