Tribalism is a social form which can exist at any level of technology. It's a complete illusion to associate it with low levels of technology. It is probably, in fact, a form of social organization second only to the family in its ability to endure.
Where psychedelics comes together with that is that it's going to require a transformation of human language and understanding to stop the momentum of the historical process, to halt nuclear proliferation, germ warfare, infantile 19th century politics, all these things. It cannot be accomplished through a frontal assault upon it by political means.