It's not their identity but their nationality that is seen as an issue by the op.

Identity in social science is a complex matter and trying to attack it with "most" is at best inaccurate. Please read the article on identity negotiation which will shed light to the picture.

[1] http://en.wikipedia.org/wiki/Identity_negotiation

PS: I'm not RTFM-ing you, it's just a topic that I'm not qualified to address myself, even though I know it's complex.