I don't think economic development is done until we have a truly global economy and I don't think that personal development is done until you are unique in all the world. Thus, I don't see how either nationalism or identity politics could ever be the basis for communities, economies and people who realize their full potential. I believe that your personal development gets retarded by conforming to the group rather than pursuing self actualization and your economic development gets retarded by clinging to national (or any regional) interests rather than global economic possibilities.
Serious question: are the parties just playing on people's ignorance or am I the ignorant one here? What am I missing?