> any form of capitalism won't allow it to stand

You raise an interesting point but I think that's an overly broad claim. Groups with strong internal adhesion and sufficiently high trust can remain xenophobic indefinitely.

It's also wrong on some level to refer to these things as arbitrary characteristics. They might be seemingly unrelated, but in a broader social context they are often far from arbitrary. Particularly when it comes to belief systems they can have direct and tangible impacts.