[rtikulit]

In my model, "tribal membership" is associated to a subconscious response we have to others when we recognize "sameness" at some level, and we subconsciously lower our social transaction cost expectations with respect to them. This is very closely related to "trust", which is largely a belief, towards a person, that we can predict their behaviour in a variety of risk situations, and it will be aligned to our own interests.

It covers a lot that other commenters have mentioned.

So with respect to the properties you've listed, it is rare for me to find someone where there's a mutual recognition of "sameness".