We find homogenous communities of this kind everywhere: the same class, the same race, the same religion, the same language, the same interests bind people together. These are the ‘dog doesn’t eat dog’ communities. They are more than merely pragmatic in purpose, because the person who is like ourselves corroborates us, while anyone who is different makes us insecure and fearful. That is why we love people like ourselves and hate people who are different. We need people who share our opinions and are on our own wavelength, to satisfy our insatiable hunger for self-corroboration.
Jürgen Moltmann, The Power of the Powerless