I was confused by the "tribal" label, as I associate that with small-groups-competing economies, vs. large scale altruistic post-scarcity economies.
I think we feel broadly closer to non-zero-sum (+Matthew Dockrey
, that's what you meant to say right?) but the reality is that is built on a lot of cheap 3rd world labor and resources. Just as it is easy to be genteel when one has a house staff doing all the work, etc.
When the economics no longer support that, event assuming we haven't descended into global upper-and-very-lower class 1-99% split, we (Americans) will all be living with much less. That's going to be a painful shock for Americans. And we tend to lash out violently when that happens.