I have dual citizens in my family; I have a feeling their story reflects those of lots of others. US (as well as Canadian and most European and Japanese) citizenship has a certain cachet, in part because most people know that those countries will stand behind their citizens to some degree. They negotiate from a position of power and wealth. Anyone who travels would want that.
The other citizenship eases repeated trips to the other country (or residence, which happens). And especially for people from places like Iran that they’ve had to abandon through no fault of their own, and who actually want to return there “when things change,” it’s a way of self-identifying as from there.
I know Palestinians who are native-born US refugees who still consider themselves to be Palestinian. The Palestinian refugee in my family considers himself fully American — but not all of his 11 siblings do, and he no longer flies in the US if he can avoid it because he wasn’t treated like one after 9/11. There are Jews using their religion to get citizenship in Israel, as well as many Americans of European extraction using their family connections (Irish-born grandfather etc) to secure dual citizenship.
It’s a global world; emigrating is not always a one-way trip forever, as it generally was even 100 years ago. People will use tools, and sometimes that tool will be used wrong, but we haven’t outlawed hammers because sometimes they’re used to murder
Wendy P.