I'm not particularly aware of the details of EU politics and couldn't name the major factions.
But I will point out that "integrate further" can itself become a tribal identity -- in some cases a fairly oppressive one, if "integrate" is taken to mean "get rid of any culturally distinctive ideas or practices that might possibly cause friction". Not saying this is specifically true of EU integration, just that it's a possible form of tribalism.
Well that's a bit my point: There's no meaning to "culturally distinctive ideas" in Europe, because all of our cultures are distinct. The only thing joining the continent together and moving the Union towards more integration is a relative homogeneity of values. And preserving our cultural richness is one of those values.
