Unfortunately though, tribal or not, there isn't much unity; people have fundamentally different ideas of how the world works. On the left we see our society as a class society, others see it as merely a society of free association. It is hard to achieve a post-scarcity society because of the way in which materials are located in the earth. There are many problems to be addressed, ecological ones not least. As much as I would like a Star Trek, I think it is a more remote goal than even the Communists and anarchists who are frequently ridiculed for utopian ideology.